17193( 6) - 20-Jun-2024 21:07:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17193 Version: 6 Check-in Time: 20-Jun-2024 21:07:06 STScI Edit Number: 3 Title WO-type Wolf-Rayet Stars: The Last Hurrah of Massive Stars ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Philip Louis Massey Lowell Observatory Y CoI: Dr. Kathryn Neugent N CoI: Dr. D. John Hillier University of Pittsburgh N CoI: Dr. Nidia Morrell Carnegie Institution of Washington N CoI: Dr. Andreas Sander Astronomisches Rechen-Institut Heidelberg N CoI: Ms. Erin Aadland Lowell Observatory N ------------------------------------------------------------------------------------ Abstract The WO class of Wolf-Rayet (WR) stars represent the most evolved type of massive star: their last hurrah before they undergo core-collapse. Abundance determinations of WOs thus give us a glimpe of the nucleosynthsis of massive stars at the very end of their lives, providing an unprecedented test of stellar evolutionary theory. We have recently finished an analysis of two WOs in the Large Magellanic Cloud (LMC) in order to determine their physical properties, including their abundances. Our results imply that the nuclear reaction rate for 12C+4He-->16O (long known to be uncertain) must be significantly lower than what is used in modern evolutionary models. This has enormous implications: among other things, it would eliminate the conflict between the theoretical black hole upper mass gap and the large black hole masses revealed by various gravitational wave events. Yet, our result hinges on the analysis of only two stars. WO-type WRs are rare: there are only three in the LMC, and the handful known in the Milky Way and in other galaxies are too reddened or distant to obtain the high-quality UV spectra necessary for their analysis. Unfortunately, the third LMC WO star, LH41-1042, has a companion only 0.1" away. However, by carefully aligning one of the narrow STIS slits, we can obtain a nearly uncontaminated spectrum of this third WO with just seven orbits. These data will provide an important test of our conclusion that the 12C+4He-->16O nuclear reaction rate is too high. LH41-1042 is the only remaining WO star that can be observed in both the UV and optical; obtaining these data can only be done with HST. ------------------------------------------------------------------------------------ Observations Description ------------------------ The WO-type Wolf-Rayet star LH41-1042 has a companion star located located 0.122" at a position angle of -10 degrees. We have previous observations of the star in the UV with COS and in the optical with Magellan, but these spectra are all contaminated by the companion; these data however, provided the means to estimate the S/N and exposure times and alleviate any safety concerns. Our goal in this program is to obtain a relatively uncontaminated spectra. We have an F225W WFC3 imge which shows that the companio is about 1.8 mag fainter than the WR star in the UV; we also know that the companion is bound to be cooler than the WR and hence more of a problem as we go to longer wavelengths. We also know it doesn't dominate at optical wavelengths as there is no hint of absorption 17193( 6) - 20-Jun-2024 21:07:06 - [ 2] lines in our high S/N ground-based data. Exposure times and safety could be readily determined thanks to our combined COS and optical fluxed spectra. Our primarily goal, then, is to obtain good S/N UV spectra in the FUV and NUV using the G140L and G230L gratings using STIS/MAMA (Visit 1) and in the optical using the G430L and G750L gratings (Visit 2). The MAMA observations will be done with the 0.2x0.06" slit (available but unsupported with G140L), and the optical with the 52x0.05". (The use of the echelle slit for the UV observations removes safety concerns given other bright UV stars in the region.) In both cases we will require an orient angle (145+/- 20 or 325+/- 20) to place the companion star off to the side of the slit. [See below] (The alternative, of observing both stars on the slit and attempting to deblend them, was considered but rejected given the sampling.) Our acquisition will be done using a well-isolated O7V star located about 10" away; we will perform the ACQ/PEAK on this offset star as well. Coordinates have been carefully measured from the WFC3 image, and converted to ICRS by comparison with Gaia DR3 values. (The position for our science target required PSF fitting to remove the influence of the companion.) Our secondary goal is to obtain good fluxes for the WR component, and for this we will use a series of very short WFC3 exposures at the end of Visit 2. The FUV/NUV observations are straightforward and will require four orbits to obtain the required S/N; we will using time-tag and obtaining 2100 sec (orbit 1) + 3000 sec (orbit 2) + 500 sec (orbit 3) in FUV/G140L. During orbit 3 we switch to NUV/G230L and obtain 500 sec(remainer of orbit 3) and 3000 sec (orbit 4). In visit 2 we acquire and peakup on the offset star as before (exposures 1 and 2), and begin with observing with the G430L grating (exposue 3). There is essentially no background in our exposures, and so to alleviate CTE effects we will be using the E1 position. We will dither along the slit to 7 positions with the 52x0.05" slit. At each position we will do a CR=3 slit; thus the individual exposure times of these 2 1sub- exposures will be 33 seconds. Each of these will reach a continuum counts of about 2000 electrons/resolution element; i.e., these are low counts in the spectrum, only in the background. Using CR=3 not only helps eliminate CRs but also keeps the exposure times short enough to avoid saturation of the strong emission lines (the intensity of which are known from our ground-based data). This occupies most of orbit 1. Near the end of orbit 1 we switch to the G750L grating and begin a similar series of exposures (exposure 4). Again we will do a CR=3 and dither along the slit to 7 positions; each of the 21 exposure components will be 104 sec in length. Again, this will reach about 2000 e counts in the continuum per sub-exposure, and avoid saturating the strongest emission lines. At the end of the visibility period of orbit 2 we then take a fringe frame (exposure 5). We then switch to WFC3 and take 0.5 sec exposures in F275W, F336W, F438W, F555W, F625W, and F814W. We use a subarray to reduce CTE effects, and use the standard 4-point dither pattern for each exposure. Note about the orient angle. The companion is at a PA of -10 degrees relative 17193( 6) - 20-Jun-2024 21:07:06 - [ 3] to the WR companion. Thus to keep it off the slit, we want the slit to be at a PA of 80 degrees (-10+90). Our understanding from the documentation is thus that we want the orient angle to be PA + 45 or PA + 225. Thus we are requestion an orient angle near 125 or near 305. We allow +/- 20 deg slop around these optimal angles. ------------------------------------------------------------------------------------ 17193( 6) - 20-Jun-2024 21:07:06 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-LH41- EXT-STAR, B0-B2 III-I RA=05H18M13.2670S +/- 0.003", J2000 V = 13.79 +/- 0.02 B-V=-0.12, G=13.9 1040 DEC=-69D13'21.36" +/- 0.003" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 2 LH41-1042 EXT-STAR, WOLF RAYET - RA=05H18M10.8910S +/- 0.003", J2000 V = 14.10 +/- 0.05 B-V=+0.07 WC DEC=-69D13'11.42" +/- 0.003" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 17193( 6) - 20-Jun-2024 21:07:06 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 7 Point_Spacing 0.15 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17193( 6) - 20-Jun-2024 21:07:06 - [ 6] Visit: 01 (STIS UV) Visit Requirements: ORIENT 105D TO 145 D; ORIENT 285D TO 325 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-LH41 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 0.4 S (0.4 -1040 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 OFFSET-LH41 STIS/CCD ACQ/PEA 0.2X0.06 MIRROR 1 0.6 S (0.6 -1040 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LH41-1042 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 BUFFER-TIME=550 1 2100 S -MAMA G (2100 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LH41-1042 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 BUFFER-TIME=550 1 3000 S -MAMA G (3000 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LH41-1042 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 BUFFER-TIME=550 1 1900 S -MAMA G (1900 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LH41-1042 STIS/NUV TIME-TA 0.2X0.06 G230L 2376 BUFFER-TIME=320 1 500 S (500 -MAMA G S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LH41-1042 STIS/NUV TIME-TA 0.2X0.06 G230L 2376 BUFFER-TIME=320 1 3000 S -MAMA G (3000 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OFFSET-LH41-1040 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A OFFSET-LH41-1040 2 STIS/CCD ACQ/PEA 0.2X0.06 MIRROR none none none none 1 N/A K LH41-1042 3 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 none none none none 1 N/A -MAMA G LH41-1042 4 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 none none none none 2 N/A -MAMA G LH41-1042 5 STIS/FUV TIME-TA 0.2X0.06 G140L 1425 none none none none 3 N/A -MAMA G LH41-1042 6 STIS/NUV TIME-TA 0.2X0.06 G230L 2376 none none none none 3 N/A -MAMA G LH41-1042 7 STIS/NUV TIME-TA 0.2X0.06 G230L 2376 none none none none 4 N/A -MAMA G 17193( 6) - 20-Jun-2024 21:07:06 - [ 7] Visit: 02 (Optical CCD) Visit Requirements: ORIENT 105D TO 145 D; ORIENT 285D TO 325 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OFFSET-LH41 STIS/CCD ACQ F28X50LP MIRROR 1 0.4 S (0.4 -1040 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 OFFSET-LH41 STIS/CCD ACQ/PEA 52X0.05 MIRROR 1 0.6 S (0.6 -1040 K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LH41-1042 STIS/CCD ACCUM 52X0.05E1 G430L 4300 CR-SPLIT=3 1 75 S (525 PATTERN 1 3 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LH41-1042 STIS/CCD ACCUM 52X0.05E1 G750L 7751 CR-SPLIT=3 1 213 S PATTERN 1 4 (1491 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X0.05 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LH41-1042 WFC3/UVI ACCUM UVIS2-C1K F275W CR-SPLIT=NO, FLASH=20 1 5 S (20 S) PATTERN 2 6-10 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 7 LH41-1042 WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=20, CR-SPLIT=NO 1 0.7 S (2.8 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 8 LH41-1042 WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=20, CR-SPLIT=NO 1 0.5 S (2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 9 LH41-1042 WFC3/UVI ACCUM UVIS2-C1K F555W FLASH=20, CR-SPLIT=NO 1 0.5 S (2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 10 LH41-1042 WFC3/UVI ACCUM UVIS2-C1K F814W FLASH=20, CR-SPLIT=NO 1 0.5 S (2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OFFSET-LH41-1040 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A OFFSET-LH41-1040 2 STIS/CCD ACQ/PEA 52X0.05 MIRROR none none none none 1 N/A K LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 2 1 N/A 1 17193( 6) - 20-Jun-2024 21:07:06 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 4 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 4 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 4 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 5 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 5 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 5 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 6 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 6 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 6 none none 3 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 7 none none 1 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 7 none none 2 1 N/A 1 LH41-1042 3 STIS/CCD ACCUM 52X0.05E G430L 4300 7 none none 3 1 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 2 2 N/A 1 17193( 6) - 20-Jun-2024 21:07:06 - [ 9] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 4 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 4 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 4 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 5 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 5 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 5 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 6 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 6 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 6 none none 3 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 7 none none 1 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 7 none none 2 2 N/A 1 LH41-1042 4 STIS/CCD ACCUM 52X0.05E G750L 7751 7 none none 3 2 N/A 1 CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 1 none 2 N/A CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 2 none 2 N/A LH41-1042 6 WFC3/UVI ACCUM UVIS2-C1 F275W 1 none none none 3 N/A S K1C-SUB LH41-1042 6 WFC3/UVI ACCUM UVIS2-C1 F275W 2 none none none 3 N/A S K1C-SUB LH41-1042 6 WFC3/UVI ACCUM UVIS2-C1 F275W 3 none none none 3 N/A S K1C-SUB LH41-1042 6 WFC3/UVI ACCUM UVIS2-C1 F275W 4 none none none 3 N/A S K1C-SUB LH41-1042 7 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 3 N/A S K1C-SUB LH41-1042 7 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 3 N/A S K1C-SUB LH41-1042 7 WFC3/UVI ACCUM UVIS2-C1 F336W 3 none none none 3 N/A S K1C-SUB 17193( 6) - 20-Jun-2024 21:07:06 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ LH41-1042 7 WFC3/UVI ACCUM UVIS2-C1 F336W 4 none none none 3 N/A S K1C-SUB LH41-1042 8 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 3 N/A S K1C-SUB LH41-1042 8 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 3 N/A S K1C-SUB LH41-1042 8 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 3 N/A S K1C-SUB LH41-1042 8 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 3 N/A S K1C-SUB LH41-1042 9 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 3 N/A S K1C-SUB LH41-1042 9 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 3 N/A S K1C-SUB LH41-1042 9 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 3 N/A S K1C-SUB LH41-1042 9 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 3 N/A S K1C-SUB LH41-1042 10 WFC3/UVI ACCUM UVIS2-C1 F814W 1 none none none 3 N/A S K1C-SUB LH41-1042 10 WFC3/UVI ACCUM UVIS2-C1 F814W 2 none none none 3 N/A S K1C-SUB LH41-1042 10 WFC3/UVI ACCUM UVIS2-C1 F814W 3 none none none 3 N/A S K1C-SUB LH41-1042 10 WFC3/UVI ACCUM UVIS2-C1 F814W 4 none none none 3 N/A S K1C-SUB 17193( 6) - 20-Jun-2024 21:07:06 - [ 11] Summary Form for Proposal 17193 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.06, 52X0.05, 52X0.05E1, F28X50LP, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, BUFFER-TIME=320, BUFFER-TIME=550, CR-SPLIT=3, CR-SPLIT=NO, FLASH=20 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 105D TO 145 D, ORIENT 285D TO 325 D, PATTERN 1 3, PATTERN 1 4, PATTERN 2 6-10 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F336W, F438W, F555W, F814W, G140L, G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, LH41-1042, OFFSET-LH41-1040 ------------------------------------------------------------------------------------------------------------------------------------