8327( 8) - 07/21/00 13:41 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8327 Version: 8 Check-in Date: 21-Jul-2000 13:40:10 1.Proposal Title: STIS observations of Eta Carinae: The central star ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Kris Davidson University of Minnesota - Twin Cities CoI: Dr. Otmar Stahl Landessternwarte Heidelberg N CoI: Dr. Andreas Kaufer Landessternwarte, Heidelberg N CoI: Dr. H.J.G.L.M Lamers SRON Utrecht N CoI: Dr. Len Kuhi University of Minnesota N CoI: Kazunori Ishibashi University of Minnesota N CoI: Dr. Theodore Gull Goddard Space Flight Center N CoI: Dr. Roberta Humphreys University of Minnesota N CoI: Dr. D.\ John Hillier University of Pittsburgh N CoI: Dr. Bernhard Wolf Landessternwarte Heidelberg N CoI: Dr. Nolan Walborn Space Telescope Science Institute N CoI: Dr. Augusto Damineli University of S a o Paulo N CoI: Dr. Peter McGregor Mount Stromlo Observatory N CoI: Dr. Sveneric Johansson University of Lund N CoI: Dr. Fred Hamann University of California N CoI: Dr. Michael Corcoran USRA/Goddard Space Flight Center N ------------------------------------------------------------------------------------ 5. Abstract (This is the original abstract written in August 1998; it remains valid in February 1999.) \\ Eta Carinae relates to a number of astrophysical topics and may be crucial for some of them, but its physical nature is certainly Not Yet Understood, and in 1998 the research situation became even more extraordinary than it was before. New STIS observations had the combination of good spatial and spectral resolution, with UV-to-far-red wavelength coverage, that we've always wanted for studies of the star itself (or its wind). However, these data were acquired during a major ``spectroscopic event.'' It has now become clear that such events recur at 5.5-year intervals, strongly affect the X- rays, and, as the STIS data show, are not easy to explain. Given a 5.5-year periodicity, the binary-vs.\-single-star question has become critical for further progress on Eta Car. If it is a binary, we need to find the parameters. STIS spectroscopy of Eta's normal state is required. Here we propose a project with several combined goals: (1) to obtain the spectrum of the star at ``normal'' times; (2) to extend the wavelength coverage below 1700 Angstrom; (3) to seek evidence for a hypothetical companion star; (4) to learn whether Eta Car varies significantly when it is not near a discrete spectroscopic event; and (5) to study the bizarre spectra of dense, slow-moving, extremely peculiar ejecta located 0.15" to 1.5" from the star. This project is coordinated with our Cycle 7 program and some planned GTO observations. ------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 2] Observations Description ------------------------ -------------------------------------------------------------------- UPDATE 2/11/00 The FUSE team has obtained a preliminary ERO spectrum at 4 ksec integration which indicates the flux to be 4x10-12 erg/cm2/sec/A between 1100 and 1180A. We calculated the expected count rates based upon that flux level for a flat spectrum and for a 30000K BB with EB-V=0.5. We also projected the flux level from Feb 1999 observations. Both lead to a global count rate of ~4x10e4 counts per second and a local count rate peak of 0.43c/p/s. The global count rate is an over estimate because most of the spectrum is replete with interstellar and nebular absorption lines. George Sonneborn, Project Scientist has committed to a longer FUSE observation in parallel with the VISIT 1 and we are targeting March 2000 for that coordination. URGENT: Observations needed early March 2000 Major revision (27 Jan 2000): The goals and some of the observations of GO 8327 and GTO 8483 have been merged. In the interests of efficiency, the main star observations with the STIS CCD (formerly "Visit 2" of GO 8327) will now be done by the GTO CVZ plan scheduled for March 2000. This fact, combined with an unexpected recent discovery, motivate a substantial change in the previous observing plan for the CCD portion of this project, GO 8327. In a sense, the GTO and GO projects are exchanging some of their goals in order to increase efficiency. The discovery involves strontium emission lines near Eta Car, an extremely remarkable development which needs to be confirmed as soon as possible. To do so, we plan to use the 0.2" STIS slit oriented at a position angle near 42.5 degrees. This is QUITE URGENT, because during the next few months when we need this information, the desired slit orientation can be attained only in the first half (approximately) of March 2000. Also, the long- awaited FUV/MAMA/echelle observations of the star require one of the CCD observations listed here, in order to verify that the UV brightness does not violate safety limits. This is another valid motivation for getting the CCD observations as soon as possible. Note: The CCD plan specified below uses only 2 orbits, rather than the 3 that were used in the previous plan. This means that one orbit allocated to GO 8327 has not yet been used. We intend to use that orbit to follow up later on developments found in the GO and GTO observations this March. (The description below was written in August 1998. In February 1999, we have adopted a plan in which the UV echelle observations are done in ``visit 1'', 1 orbit, and slit/CCD observations are done in ``visit 2'', 3 orbits. Nearly complete wavelength coverage is achieved.) \\ Note that our primary intent is to discover how Eta Car's spectrum changes during its 5.5 -year period. We cannot wait to see what the planned GTO observations show, and then propose further observations, because then it would be too late; follow-up observations are needed in Cycle 8, a critical part of the period. (On the other hand, once the general nature of changes well out of the recent spectroscopic event has been established in Cycle 8, then later monitoring with STIS shouldn't need as many orbits.) vspace1mm 1. STIS/CCD, 1700--10000 Angstrom with `M' gratings and 0.1"-wide slit: \ Let's say that a ``major'' observation covers the full wavelength range in 5 orbits (more about this below), and a ``minor'' observation uses one orbit to sample just a few wavelength intervals. Our December 1997 one-orbit observation was close to phase zero in Eta's period, and our major observation was in March. Gull's GTO plan will obtain another minor observation in late 1998 and a major one in March 1999, near phase 0.2. The next major observation after that should be fairly close to phase 0.5 (September 2000) but on the other hand we also shouldn't allow much more than a year to elapse after the previous one; a good compromise would be any time in April--June 2000. We also want a minor observation about halfway between the major ones, in order to reduce the gap; September--November 1999 would be good for that. vspace1mm A ``major observation'' is valuable because Eta's spectrum has hundreds of significant emission lines of various types, and its behavior is still sufficiently unfamiliar that we can't safely predict which wavelengths may be neglected. Full wavelength coverage requires 30 grating tilts, and the observing plan is complex because we must avoid filling the data buffers with a series of short (i.e., G750M) exposures, while the need for flat- fields in the far red imposes further constraints. Our 1997--98 data confirmed that suitable integration times range from a fraction of a second for the shortest HAlpha exposures to a few minutes in the UV. On more than one occasion we have tried hard to devise a plan that fits all the grating tilts into 4 orbits; but we've found that 5 are necessary. (Omitting the two or three least valuable grating tilts doesn't alter this conclusion, because they don't use much of the time.) Our one-orbit ``minor'' observation at the end of 1997 sampled four of the most important wavelength intervals (HAlpha, 3800--4070 Angstrom, and two in the UV). vspace1mm In summary, the needed STIS/CCD data can be obtained with one orbit in late 1999 plus 5 orbits in the 2nd quarter of 2000. Moderately earlier dates are also acceptable. vspace1mm 2. STIS/FUV-MAMA, 1250--1700 Angstrom with the echelle E140M: As noted in the Scientific Justification, this is the wavelength range where the star's surface is most visible (albeit ill-defined). Here the most useful features are absorption lines, not emission lines as at longer wavelengths in Eta Car; and here the presence of a companion star may be most detectable. We choose the echelle not because of its high spectral resolution, but rather because it covers this whole wavelength interval in one observation and also because there is no danger of Eta Car being close to the echelle's bright-object limits. No far-UV STIS observation of Eta has been made yet, and none is included in the GTO plan. We request two observations at different times, in order to look for possible changes (especially those that may indicate a companion star). It is highly desirable, of course, for the echelle observations to be made within a few weeks of the STIS/CCD observations, ideally within a few days. vspace1mm According to low-resolution HRS observations (ref.\ 6), the continuum level at these wavelengths is roughly 1e- 12 erg cm^-2 s^-1 AA^-1 or perhaps somewhat less. This implies a count rate of the order of 0.25 counts per second per Lambda- pixel. Not needing the full echelle resolution, we can integrate over about ten Lambda-pixels, giving between 100 and 200 counts per minute in an appropriate-sized wavelength element. Evidently 10 or 20 minutes gives a satisfying S/N ratio, so one orbit is sufficient. Since an orbit provides some extra time, we may choose to do two separate exposures -- one with the 0.2times0.2" aperture and another with the 0.2times0.06" aperture, or perhaps observe the special ejecta 0.2" NW of the star. vspace1mm 3. Concerning Cycles 9 and 10: We think that future STIS monitoring of Eta Car will be needed, though not necessarily with the intensive full- wavelength-coverage described above. Phase 0.5 in the 5.5- year period will occur late in the year 2000, so Cycles 9 and 10 will carry the star into the second half of its activity period, similar to 1995-to-early-1997 when FOS and HRS data were acquired. Therefore we have requested 3 Cycle 9 orbits and 3 Cycle 10 orbits on the cover page of this proposal. It isn't safe to specify details this far in advance, but we tentatively envision a 2-orbit STIS/CCD observation plus a 1- orbit FUV-MAMA-echelle observation for each year. vspace1mm 4. Perhaps if is fair to note that the volume of data resulting from a 5-orbit STIS/CCD observation of Eta Car is Dauntingly Large. This bright, spatially complex, spectroscopically rich object takes full advantage of high spatial and spectral resolution at all 30 grating tilts. Implications of the data range over diverse topics. The data-reduction effort is large and then analyses such as wind-atmosphere models, nebular diagnostics, etc., must be applied to various different spatial samples. vspace1mm Therefore, the effective size of this project is honestly more proportionate to the number of CoIs than to the number of orbits. Real Time Justification ----------------------- (The following text was written in August-September 1998.) As noted in the description of observations, if possible the observations should be scheduled for September--November 1999 and April--June 2000. We hope that the slit can be oriented to include particular ejecta knots shown in Fig.\ 2 (the spacecraft orientation is favorable for this purpose in September, October, and April). The story of X-rays in Eta Car is a central and dramatic part of recent developments, highly relevant to the spectroscopic event and the binarity question, but it is too complex to describe in the Scientific Justification above; see refs.\ 3, 9. Corcoran is heavily involved in planning X- ray observations that should coincide with HST's Cycle 8. Eta is scheduled as one of AXAF's ``first light'' targets, and also in Corcoran's GO program to spectrally resolve line widths and shapes at energies above 2 keV. Proposals to continue the RXTE monitoring and to get additional ASCA data have been submitted but not yet reviewed. vspace1mm Several CoIs will be monitoring Eta Car with ground-based spectroscopy. McGregor will use the Coude echelle spectrograph on the 74-inch telescope at Mt.\ Stromlo, with a 1"--wide slit, 5 km/s resolution from 3800 to 10200 Angstrom about twice a year. Damineli will observe selected wavelengths with lower resolution several times per year, using the 1.6-m telescope of LNA in Brazil, and will also do repeated 7-mm radio observations. Wolf, Stahl, and Kaufer hope to obtain almost one observation per week for the next several years, using the ``FEROS'' instrument on a 1.5-m telescope at ESO. \ Each FEROS observation covers the 3700-- 8600 Angstrom range at a resolution of about R \ ~ \ 48000. Although none of these data will be able to separate out the star itself, we hope that our STIS observations will help to show how the ground-based spectrum is related to the star's spectrum, thus greatly clarifying the physical meaning of the ground- based data. Calibration Justification ------------------------- SEE ADDITIONAL COMMENTS, BELOW. Additional Comments ------------------- (Fresh comments, February 1999) This observing plan is unconventional in several obvious respects as noted by RPS2. (1) Special catalog ZZZQ is needed because the GSC is inadequate in the field of Eta Carinae. We have used ZZZQ in all our past HST acquisitions of this object. \ (2) The only way to include sufficient wavelength coverage in the alloted number of orbits is to omit WAVECAL for most (not all) the observations. We have done this before (Ted Gull's GTO observations of Eta) and it's OK, partly because Eta's diffuse ejecta provide many internal wavelength references. Omitting the WAVECALs allows a terrific rate of real data acquisition in this case. (3) We omit fringe-flats; ask Ted Gull about this. \ A few other details of the plan are unusual too. ------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 3] Data Distribution Paper Products: NO Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ETA-CAR-A- STAR, Eta Carinae star RA=10H 45M 3.62S +/- .3", DEC=- J2000 V = 8.0+/-0.5 OFFSET 59D 41' 4.1" +/- .3", PLATE- B = 9.0+/-0.5 ID=ZZZQ F(2000)=0.7+/-0.3e-12 F(4000)=1.2+/-0.4e-12 F(6000)=2.3+/-0.6e-12 F(9500)=4.4+/-1.2e-12 Coordinate Source: Comments: Special catalog ZZZQ is needed because GSC is v poor in this field. 2 ETA-CAR-ECH1 STAR, ETA CARINAE STAR R=0.029999999999999999", J2000 V = 8.0+/-0.5 PA=140D, FROM 1 B = 9.0+/-0.5 F(2000)=0.7+/-0.3e-12 Coordinate Source: Comments: Offset location for UV echelle obs only. 3 ETA-CAR-ECH2 STAR, ETA CARINAE STAR R=0.070000000000000007", J2000 V = 8.0+/-0.5 PA=320D, FROM 1 B = 9.0+/-0.5 F(2000)=0.7+/-0.3e-12 Coordinate Source: Comments: Offset location for UV echelle obs only. 4 ETA-CAR-D STAR, ETA CARINAE STAR, R=0.255", PA=337.8D, FROM 1 J2000 F-LINE(2507)=5+/-1e-12 STAR, EJECTA V = 8.0+/-0.5 Coordinate Source: Comments: [Fe II] 2507, 9 line brightest in Weigelt component D 5 ETA-CAR-SR ISM, EJECTA, STAR, XI-OFF=0.0"+/- 0.01", ETA- J2000 V = 8.0+/-0.5 LUMINOUS BLUE VARIABLE OFF=0.10000000000000001"+/- 0.01", FROM 1 Coordinate Source: GUIDE_STAR_CATALOG 8327( 8) - 07/21/00 13:41 - [ 5] Visit: 01 Visit Priority: Visit Requirements: GROUP 1-2 WITHIN 60 D BEFORE 31-Mar-2000 On Hold Comments: Additional Comments: Do in March 2000 in coordination with FUSE. Use special catalog ZZZQ for acq. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 ETA-CAR-A-O STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.2 S FFSET CD Comments: Acquisition is like visit 2. ------------------------------------------------------------------------------------------------------------------------------------ 20 ETA-CAR-A-O STIS/C ACQ/PEA 52X0.1 G750M 7795 1 0.5 S FFSET CD K ------------------------------------------------------------------------------------------------------------------------------------ 40 ETA-CAR-ECH STIS/F ACCUM 0.2X0.2 E140M 1425 WAVECAL=NO 1 1000 S 1 UV-MAM A Comments: Expect roughly 0.25 ct/s per lambda-pixel. We use the echelle for its broad wavelength coverage, not its high spectr res. ------------------------------------------------------------------------------------------------------------------------------------ 50 ETA-CAR-ECH STIS/F ACCUM 0.2X0.2 E140M 1425 1 1000 S 2 UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 60 WAVE STIS/F ACCUM 0.2X0.2 E140M 1425 1 DEF UV-MAM A Comments: Explicit, because WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 6] Visit: 02 Visit Priority: Visit Requirements: ORIENT 3.80D TO 3.80D ORIENT 183.80D TO 183.80D On Hold Comments: Additional Comments: Both ORIENT ranges are equally good. Use special catalog ZZZQ for acq. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 100 ETA-CAR-A-O STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.2 S FFSET CD Comments: We have used these same acquisition parameters before. ------------------------------------------------------------------------------------------------------------------------------------ 110 ETA-CAR-A-O STIS/C ACQ/PEA 52X0.2 G750M 7795 1 0.5 S FFSET CD K Comments: This wavelength interval has no bright emis lines, unusual in spectrum of EtaCar. ------------------------------------------------------------------------------------------------------------------------------------ 120 ETA-CAR-A-O STIS/C ACCUM 52X0.2 G230MB 1713 GAIN=1,CR-SPLIT=NO,SIZEAXIS2=512 1 100 S MAX DUR FFSET CD Comments: Brightness verification for VISIT 1 UV MAMA observations. WAVECAL explicitly dropped. ------------------------------------------------------------------------------------------------------------------------------------ 130 ETA-CAR-A-O STIS/C ACCUM 52X0.2 G750M 6768 GAIN=4,SIZEAXIS2=512,WAVECAL=NO, 1 0.3 S FFSET CD CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 205 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 6768 GAIN=4,CR-SPLIT=2 1 150 S CD 1 Comments: BD~7x sat 6563. Ni II 6666A 12500DN BD is partially behind F1 (0.1" offset from Star) ------------------------------------------------------------------------------------------------------------------------------------ 210 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 6768 GAIN=4,CR-SPLIT=2,SIZEAXIS2=512 1 10 S MAX DUR CD 1 Comments: This short exposure should have no saturated pixels. BD~8900, IN~100 ------------------------------------------------------------------------------------------------------------------------------------ 215 WAVE STIS/C ACCUM 52X0.2F G750M 6768 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 220 ETA-CAR-SR STIS/C ACCUM 52X0.2F G230MB 2836 GAIN=1,CR-SPLIT=2 1 250 S CD 1 Comments: BD~3100, IN~50 ------------------------------------------------------------------------------------------------------------------------------------ 225 WAVE STIS/C ACCUM 52X0.2F G230MB 2836 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 230 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 7283 CR-SPLIT=2,GAIN=1 1 20 S CD 1 Comments: BD<15000 IN ~70DN. Use GAIN=1 to minimize video pickup. ------------------------------------------------------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 232 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 7283 GAIN=1,CR-SPLIT=2 1 200 S MAX DUR CD 1 Comments: Includes important [Ni II] lines of Hillier and Allen. BD could be 5x overexposed. IN 1800 ------------------------------------------------------------------------------------------------------------------------------------ 235 WAVE STIS/C ACCUM 52X0.2F G750M 7283 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 240 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 9851 CR-SPLIT=2,GAIN=1 1 175 S CD 1 Comments: BD~23000 IN~4100 ------------------------------------------------------------------------------------------------------------------------------------ 245 WAVE STIS/C ACCUM 52X0.2F G750M 9851 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 250 ETA-CAR-SR STIS/C ACCUM 52X0.2F G430M 3936 CR-SPLIT=2,GAIN=1 1 150 S CD 1 Comments: BD~850 IN~200 ------------------------------------------------------------------------------------------------------------------------------------ 255 WAVE STIS/C ACCUM 52X0.2F G430M 3936 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 260 ETA-CAR-SR STIS/C ACCUM 52X0.2F G430M 4194 GAIN=4,CR-SPLIT=2 1 250 S CD 1 Comments: G=4 change for BD now ~19000 IN~375 ------------------------------------------------------------------------------------------------------------------------------------ 265 WAVE STIS/C ACCUM 52X0.2F G430M 4194 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 270 ETA-CAR-SR STIS/C ACCUM 52X0.2F G430M 4961 GAIN=4,CR-SPLIT=2 1 100 S CD 1 Comments: BD~4200, IN~82. ------------------------------------------------------------------------------------------------------------------------------------ 275 WAVE STIS/C ACCUM 52X0.2F G430M 4961 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 280 ETA-CAR-SR STIS/C ACCUM 52X0.2F G230MB 2697 GAIN=1,CR-SPLIT=2 1 270 S CD 1 Comments: BD~1260, IN~70 ------------------------------------------------------------------------------------------------------------------------------------ 285 WAVE STIS/C ACCUM 52X0.2F G230MB 2697 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 290 ETA-CAR-SR STIS/C ACCUM 52X0.2F G230MB 2557 GAIN=1,CR-SPLIT=2 1 200 S MAX DUR CD 1 Comments: BD~3650, IN~80 Includes 2507 [Fe II] lines. ------------------------------------------------------------------------------------------------------------------------------------ 295 WAVE STIS/C ACCUM 52X0.2F G230MB 2557 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 8] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 300 ETA-CAR-SR STIS/C ACCUM 52X0.2F G750M 9336 GAIN=1,CR-SPLIT=2 1 125 S CD 1 Comments: BD 9500DN IN 1450DN ------------------------------------------------------------------------------------------------------------------------------------ 305 WAVE STIS/C ACCUM 52X0.2F G750M 9336 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 310 ETA-CAR-SR STIS/C ACCUM 52X0.2F G230LB 2375 GAIN=1,CR-SPLIT=2 1 60 S MAX DUR CD 1 Comments: Low Res check of NUV Emission from Sr region. Use GAIN=1 as 1/5 medium disp exp and non saturated in 99. ------------------------------------------------------------------------------------------------------------------------------------ 315 WAVE STIS/C ACCUM 52X0.2F G230LB 2375 CR-SPLIT=NO 1 DEF CD 1 ------------------------------------------------------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 9] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Fe II lines at 2507 and 2509 have been measured to be 5.3 e-12 erg/cm2/s and 4.0 e -12 erg/cm2/s using G230MB in March 2000. Fluxes are very similar to Feb 1999. The lines appear to be ~1A wide, but are optically pumped. If within E230H and STIS PSF, would get maximum 30c/s/pixel, but more likely ~3c/s/pixel with the 1A width using ETC. 0.2x0.2 aperture selected because not limiting ORIENT for this visit. Eta Car is well away from the blob and is within global brightness limit with an estimated global count rate 0f 2.5e4c/s. Again, Eta Car will be outside the aperture as there is a 0.250" offset. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 ETA-CAR-A-O STIS/C ACQ F25ND3 MIRROR 1 0.5 S FFSET CD ------------------------------------------------------------------------------------------------------------------------------------ 20 ETA-CAR-A-O STIS/C ACQ/PEA 52X0.1 G750M 7795 1 0.5 S FFSET CD K ------------------------------------------------------------------------------------------------------------------------------------ 30 ETA-CAR-A-O STIS/C ACCUM 52X0.1 G750M 6768 CR-SPLIT=2,GAIN=1,SIZEAXIS2=256, 1 0.6 S FFSET CD WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 40 ETA-CAR-A-O STIS/C ACCUM 52X0.1 G750M 6768 CR-SPLIT=2,SIZEAXIS2=256,GAIN=4 1 5 S FFSET CD ------------------------------------------------------------------------------------------------------------------------------------ 50 ETA-CAR-D STIS/N ACCUM 0.2X0.2 E230H 2762 1 800 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 60 WAVE STIS/N ACCUM 0.2X0.2 E230H 2762 1 DEF UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 70 ETA-CAR-D STIS/N ACCUM 0.2X0.2 E230H 2513 1 800 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 80 WAVE STIS/N ACCUM 0.2X0.2 E230H 2513 1 DEF UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8327( 8) - 07/21/00 13:41 - [ 10] Summary Form for Proposal 8327 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F25ND3 52X0.1 0.2X0.2 52X0.2 52X0.2F1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT WAVECAL=NO SIZEAXIS2=512 CR-SPLIT=NO CR-SPLIT=2 GAIN=4 GAIN=1 SIZEAXIS2=256 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 1-2 WITHIN 60 D BEFORE 31-Mar-2000 ORIENT 3.80D TO 3.80D ORIENT 183.80D TO 183.80D MAX DUR ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G750M E140M G230MB G430M G230LB E230H ------------------------------------------------------------------------------------------------------------------------------------ Target Names ETA-CAR-A-OFFSET ETA-CAR-ECH1 ETA-CAR-ECH2 WAVE ETA-CAR-SR ETA-CAR-D ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 7795 1425 1713 6768 2836 7283 9851 3936 4194 4961 2697 2557 9336 2375 2762 2513 ------------------------------------------------------------------------------------------------------------------------------------