6068( 0) - 07/18/95 19:46 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6068 Version: ********** Check-in Date: ********** 1.Proposal Title: Gamma Draconis: Transition Region and Coronal Activity Beyond ``The Coronal Dividing Line'' ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Cool Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Alexander Brown University of Colorado CoI: Graham Harper University of Colorado N CoI: Kenneth Carpenter Goddard Space Flight Center N CoI: Bryan Deeney University of Colorado N CoI: Richard Robinson Computer Sciences Corporation N CoI: Jeffrey Linsky University of Colorado N ------------------------------------------------------------------------------------ 6. Abstract Gamma Draconis is the first, normal, single late K giant (K5 III) located on the red side of the coronal ``dividing line'' that shows conclusive evidence for hot (~ 10^5 K) transition region (TR) and coronal plasma. Gamma Dra also has a cool stellar wind with a peak outflow velocity of 70 kms. This star is the first convincing example of a luminosity class III hybrid-chromosphere star that is not part of a binary system. We propose to measure the physical properties of the TR and wind of Gamma Dra by observing emission lines reflecting the electron density and atmospheric dynamics using the GHRS. Gamma Dra allows us to study stellar atmospheric properties at the lowest levels of magnetic activity observable. Density -sensitive lines of O IV, OV, Si III, and C III will be used to estimate the TR electron density, while the C II intersystem multiplet will give chromospheric densities. These optically-thin emission lines are also accurate tracers of turbulent and flow velocities. Characteristics of the wind flow will be measured using the absorption features seen in Fe II emission lines with a variety of optical depths. These results will be compared with our earlier observations of coronal and non-coronal cool stars. ------------------------------------------------------------------------------------ 6068( 0) - 07/18/95 19:46 - [ 2] Observations Description ------------------------ The observations will all be obtained using GHRS Side 2 and the G160M, G200M, G270M, and ECH-B Gratings. Details are given in the Table below. The signal-to -noise values are given per diode. For the TR lines a S/N ~15- 20 is sought for the stronger lines and ~ 10 for the weaker lines. The density-sensitive O IV lines will have S/N between 5 and 9. A S/N value of >= 40 is necessary to get a good fit to the absorption structure in the Fe II lines, if it is present. The 2345, 2610, and 2754 A exposures are higher priority than the 2850 A exposure. We will obtain all of the exposures in 5 -7 minute repeated ACCUM's to allow the removal of a geomagnetic and thermal drifts and preserve the highest accuracy of the wavelength/velocity scale. ___________________________________________________________________ Ion Grating Wavelength count exposure S/N (A) rate (min) ___________________________________________________________________ O IV], Si IV G160M 1377-1411 0.12 (Si IV 1401) 54 10 0.02 (O IV 1404 ) 5 O V], H LyAlpha G160M 1204-1240 0.08 (Si III 1206) 40 10 Si III, N V 0.07 (N V 1238) 6 C IV, CO G160M 1530-1566 0.19 (C IV 1548) 47 15 Si III], C III] G200M 1880 -1920 0.26 47 14 C II], Fe II G270M 2345 0.5 22 62 Fe II G270M 2610 1.0 27 49 Fe II G270M 2754 1.5 11 61 Mg I, Fe I G270M 2850 2.5 11 38 Mg II ECH-B 2800 64 4,2 85 __________________________________________________________________ Real Time Justification ----------------------- None. None. Calibration Justification ------------------------- We include three WAVE observations (lines 8, 48, and 78) immediately prior to spectra for which the highest achievable wavelength accuracy is required. These spectra are the most vital for determining the absolute velocities of TR and chromospheric emission lines. There should be NO carrousel motion or long (e.g. Earth occultations) between these WAVE spectra and the following stellar spectra. Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6068( 0) - 07/18/95 19:46 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD164058 STAR, K III-I RA=17H 56M 36.37S +/- 0.01S, 2000 V = - V= 2.23 +/- 0.01 DEC=+51D 29' 20.21" +/- 0.03" 27.6 B-V= +1.521 +/- 0.005 TYPE= K5III Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0009 -0.019 0.020 6068( 0) - 07/18/95 19:46 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD164058 HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 1.8S ONBOARD ACQ FOR 2-60 SEARCH-SIZE=3 Comments: STEP-TIME = 0.2 SEC (approx 20,000 cts in STEP-TIME) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD164058 HRS ACCUM 2.0 ECH-B20 2799 COMB=FOUR, STEP 1 108.8S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 10 HD164058 HRS ACCUM 2.0 G270M 2833 COMB=FOUR, STEP 1 652.8S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 20 HD164058 HRS ACCUM 2.0 G200M 1900 COMB=FOUR, STEP 2 1414.4S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 30 HD164058 HRS ACCUM 2.0 G160M 1548 COMB=FOUR, STEP 2 1414.4S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 40 HD164058 HRS ACCUM 2.0 G160M 1222 COMB=FOUR, STEP 2 1196.8S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 50 WAVE HRS ACCUM SC2 G160M 1394 COMB=FOUR, STEP 1 64S -PATT=3, DOPPLER=OFF, FP -SPLIT=NO Comments: CALIB FOR 60 ------------------------------------------------------------------------------------------------------------------------------------ 60 HD164058 HRS ACCUM 2.0 G160M 1394 COMB=FOUR, STEP 2 1632S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 70 HD164058 HRS ACQ/PEA 0.25 MIRROR-N2 SEARCH-SIZE=5 1 10S ONBOARD ACQ FOR 80-130 KUP Comments: STEP-TIME = 0.4 SEC ------------------------------------------------------------------------------------------------------------------------------------ 6068( 0) - 07/18/95 19:46 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 80 WAVE HRS ACCUM SC2 ECH-B20 2799 COMB=FOUR, STEP 1 38.4S SEQ 80-90 NON-INT -PATT=3, DOPPLER=OFF, FP -SPLIT=NO Comments: CALIB FOR 90 ------------------------------------------------------------------------------------------------------------------------------------ 90 HD164058 HRS ACCUM 0.25 ECH-B20 2799 COMB=FOUR, STEP 1 217.6S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 100 HD164058 HRS ACCUM 0.25 G270M 2754 COMB=FOUR, STEP 1 652.8S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 110 HD164058 HRS ACCUM 0.25 G270M 2610 COMB=FOUR, STEP 1 1632S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 120 WAVE HRS ACCUM SC2 G270M 2345 COMB=FOUR, STEP 1 51.2S -PATT=3, DOPPLER=OFF, FP -SPLIT=NO Comments: CALIB FOR 130 ------------------------------------------------------------------------------------------------------------------------------------ 130 HD164058 HRS ACCUM 0.25 G270M 2345 COMB=FOUR, STEP 1 1305.6S -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 6068( 0) - 07/18/95 19:46 - [ 6] Summary Form for Proposal 6068 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ACQ/PEAKUP ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN SEARCH-SIZE=3 FP-SPLIT=STD DOPPLER=DEF STEP-PATT=DEF COMB=FOUR FP-SPLIT=NO SEARCH-SIZE=5 DOPPLER=OFF STEP-PATT=3 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Cool Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2-60 ONBOARD ACQ FOR 80-130 SEQ 80-90 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 ECH-B20 G270M G200M G160M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD164058 WAVE ------------------------------------------------------------------------------------------------------------------------------------