6723( 16) - 08/05/96 12:16 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6723 Version: 16 Check-in Date: 05-Aug-1996 13:04:58 1.Proposal Title: Physical conditions near high galactic latitude molecular clouds ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle INTERSTELLAR MEDIUM GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: J. CHRIS BLADES SPACE TELESCOPE SCIENCE INSTITUTE CoI: Meena Sahu Space Telescope Science Institute Y CoI: Lida He Rensselaer Polytechnic Institute N ------------------------------------------------------------------------------------ 6. Abstract Ultra high resolution observations (R ~ 10^6) of the high latitude stars HD 28497, HD 89688, HD 141569 and HD 151741, show complex NaI (D1 and D2) and Ca II K interstellar absorption line profiles. Due to their location near high galactic latitude molecular clouds, these stars are well- suited background sources for detailed spectroscopic studies of molecular clouds as well as gas in the near halo. The optical data show that the column densities are low and the clouds are well resolved with a wide range of physical conditions, making these rich and important sightlines for ultraviolet studies. We would like to study the distribution and physical characteristics of the neutral (HI), ionized (HII) and highly ionized (hot) gas associated with the individual absorbing components observed in the NaI and CaII absorption line profiles. HST GHRS spectra of the interstellar absorption lines of MgI, CI, SiII, FeII, MgII, CrII, ZnII, SiIV, CIV and NV will allow us to trace the extent of the neutral, ionized and hot gas and will be used to estimate kinetic temperatures, electron densities, pressures, the depletions of the various elements in the HI gas, and the composition of the grains. Further, these observations will determine if high galactic latitude molecular clouds are indeed embedded in the hot local interstellar medium as suggested by X-ray observations and how the physical conditions in these clouds differ from other diffuse interstellar clouds. ------------------------------------------------------------------------------------ 6723( 16) - 08/05/96 12:16 - [ 2] Observations Description ------------------------ We plan to obtain high S/N HST GHRS echelle spectra with the highest wavelength resolution possible. To achieve this, the observations will be made with the SSA and by sampling the data using four substep bins per diode. The FP-Split option will be utilized to get a better estimate of the fixed pattern noise and thus improve S/N. The lines we would like to observe are listed in the table below together with their wavelengths and the echelle setting required for the observation. The program would require four ECH-A wavelength settings and five ECH-B settings per star. The exposure times have been computed based on the UV fluxes for the stars (from published literature) and taking into account the effects of reduced GHRS echelle blaze efficiences and the reduced SSA efficiency (GHRS Handbook, Version 6.0). For S/N ~ 100:1, we need exposure times for ECH-A settings ranging from 12 to 40 minutes and ECH-B settings ranging from 6 to 20 minutes. If we take into account the target acquisition and exposure overheads and specify that the change from ECH-A to ECH-B be done during the occultation period, we would require a total of 5 orbits for HD 28497 and 6 orbits each for the other three stars. This would imply that a total of 23 orbits would be necessary to complete our proposed observations. begintabularlll SPECIES & Lambda Angstrom \\ & ECHELLE SETTING, & &, CIV & 1548.19 & ECH-A36, & 1550.77 & ECH-A36, SiIV&1393.76 & ECH-A40, &1402.77 & ECH- A40, CI & around 1278 & ECH-A44, MgII&1239.93 & ECH-A45, NV & 1238.82 & ECH- A45, & 1242.8& ECH-A45, MgI & 2852.96 & ECH-B20, & 2026.48 & ECH- B28, FeII& 2600.17& ECH-B22, & 2374.46& ECH-B24, CrII& 2062.23& ECH-B27, & 2066.16& ECH- B27, ZnII& 2026.14& ECH- B28, & 2062.66& ECH-B27, SiII& 1808.01 & ECH-B31, & & , endtabular Real Time Justification ----------------------- None None Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6723( 16) - 08/05/96 12:16 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD28497 Star, B0-B2 V-IV RA=04H 29M 6.92S +/-0.01S, DEC=- J2000 V = 5.6+/-0.3 13D 02' 54.1" +/-0.1" B-V = -0.20+/-0.05 TYPE=B2V E(B-V) = 0.10 Comments: Coordinates are from Hipparcos INCA, F(1400)=5.1E-10, F(2000)=2.44E-10 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 2 HD89688 Star RA = 10H 21M 2.00S +/- 0.01S, J2000 V = 6.68+/-0.3 DEC = 02D 17' 22.8" +/- 0.1" B-V = -0.08+/-0.01 TYPE=B3V E(B-V) = 0.16 Comments: Coordinates are from Hipparcos INCA, F(1400)=4.5E-11, F(2000)=3.1E-11 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 6723( 16) - 08/05/96 12:16 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 101 HD28497 HRS ACQ 2.0 MIRROR-N1 SEARCH-SIZE=3,BRIGHT=RETURN 1 1.8 S ONBOARD ACQ FOR 102 Comments: STEP-TIME=0.2S; EXPECT 10400 COUNTS IN STEP-TIME ------------------------------------------------------------------------------------------------------------------------------------ 102 HD28497 HRS ACQ/PEA 0.25 MIRROR-N1 SEARCH-SIZE=5 1 5 S ONBOARD ACQ FOR 103-111 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 103 HD28497 HRS ACCUM 0.25 ECH-A 1241 FP-SPLIT=DSFOUR,STEP-PATT=7 1 544.0 S Comments: MgII (1239.93), NV (1238.82, 1242.8) ------------------------------------------------------------------------------------------------------------------------------------ 104 HD28497 HRS ACCUM 0.25 ECH-A 1277 FP-SPLIT=DSFOUR,STEP-PATT=7 1 979.2 S Comments: CI (AROUND 1280) ------------------------------------------------------------------------------------------------------------------------------------ 105 HD28497 HRS ACCUM 0.25 ECH-A 1393 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1196.8 Comments: SiIV (1393.76) ------------------------------------------------------------------------------------------------------------------------------------ 106 HD28497 HRS ACCUM 0.25 ECH-A 1402 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1196.8 Comments: SiIV (1402.97) ------------------------------------------------------------------------------------------------------------------------------------ 107 HD28497 HRS ACCUM 0.25 ECH-A 1549 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1632.0 Comments: CIV (1548.19, 1550.77) ------------------------------------------------------------------------------------------------------------------------------------ 108 HD28497 HRS ACCUM 0.25 ECH-A 1657 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1088.0 Comments: CI (1656.92) ------------------------------------------------------------------------------------------------------------------------------------ 109 HD28497 HRS ACCUM 0.25 ECH-A 1608 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1523.2 Comments: FeII (1608.45) ------------------------------------------------------------------------------------------------------------------------------------ 110 HD28497 HRS ACCUM 0.25 ECH-A 1527 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1523.2 Comments: SiII (1526.71) ------------------------------------------------------------------------------------------------------------------------------------ 111 HD28497 HRS ACCUM 0.25 ECH-A 1335 FP-SPLIT=DSFOUR,STEP-PATT=7 3 326.4 S Comments: CII, CII* (1334.53, 1335.71) ------------------------------------------------------------------------------------------------------------------------------------ 6723( 16) - 08/05/96 12:16 - [ 5] Visit: 02 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 ------------------------------------------------------------------------------------------------------------------------------------ 201 HD28497 HRS ACQ 2.0 MIRROR-N1 SEARCH-SIZE=3,BRIGHT=RETURN 1 1.8 S ONBOARD ACQ FOR 202 Comments: STEP-TIME=0.2S; EXPECT 10400 COUNTS IN STEP-TIME ------------------------------------------------------------------------------------------------------------------------------------ 202 HD28497 HRS ACQ/PEA 0.25 MIRROR-N1 SEARCH-SIZE=5 1 5 S ONBOARD ACQ FOR 219-226 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 219 HD28497 HRS ACCUM 0.25 ECH-A 1335 FP-SPLIT=DSFOUR,STEP-PATT=7 1 761.6 S Comments: CII, CII* (1334.53, 1335.71) ------------------------------------------------------------------------------------------------------------------------------------ 220 HD28497 HRS ACCUM 0.25 ECH-B 2374 FP-SPLIT=DSFOUR,STEP-PATT=7 1 326.4 S Comments: FeII (2374.46) ------------------------------------------------------------------------------------------------------------------------------------ 221 HD28497 HRS ACCUM 0.25 ECH-B 2852 FP-SPLIT=DSFOUR,STEP-PATT=7 1 761.6 S Comments: MgI (2852.96) ------------------------------------------------------------------------------------------------------------------------------------ 222 HD28497 HRS ACCUM 0.25 ECH-B 2600 FP-SPLIT=DSFOUR,STEP-PATT=7 1 544.0 S Comments: FeII (2600.17) ------------------------------------------------------------------------------------------------------------------------------------ 223 HD28497 HRS ACCUM 0.25 ECH-B 2064 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1632.0 Comments: ZnII (2062.66) CrII (2062.33, 2066.16) ------------------------------------------------------------------------------------------------------------------------------------ 224 HD28497 HRS ACCUM 0.25 ECH-B 2026 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1632.0 Comments: ZnII (2026.14), MgI(2026.48) ------------------------------------------------------------------------------------------------------------------------------------ 225 HD28497 HRS ACCUM 0.25 ECH-B 1808 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1088.0 Comments: SiII (1808.01) ------------------------------------------------------------------------------------------------------------------------------------ 226 HD28497 HRS ACCUM 0.25 ECH-B 2800 FP-SPLIT=DSFOUR,STEP-PATT=7 1 979.2 S Comments: MgII (2796.35 and 2803.53) ------------------------------------------------------------------------------------------------------------------------------------ 6723( 16) - 08/05/96 12:16 - [ 6] Visit: 03 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 ------------------------------------------------------------------------------------------------------------------------------------ 301 HD89688 HRS ACQ 2.0 MIRROR-N1 SEARCH-SIZE=3,BRIGHT=RETURN 1 1.8 S ONBOARD ACQ FOR 302 Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 302 HD89688 HRS ACQ/PEA 0.25 MIRROR-N1 SEARCH-SIZE=5 1 5 S ONBOARD ACQ FOR 303-313 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 303 HD89688 HRS ACCUM 0.25 ECH-A 1393 FP-SPLIT=DSFOUR,STEP-PATT=7 1 979.2 S Comments: SiIV (1393.76) ------------------------------------------------------------------------------------------------------------------------------------ 304 HD89688 HRS ACCUM 0.25 ECH-A 1402 FP-SPLIT=DSFOUR,STEP-PATT=7 1 979.2 S Comments: SiIV (1402.97) ------------------------------------------------------------------------------------------------------------------------------------ 305 HD89688 HRS ACCUM 0.25 ECH-A 1549 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1088.0 Comments: CIV (1548.19, 1550.77) ------------------------------------------------------------------------------------------------------------------------------------ 306 HD89688 HRS ACCUM 0.25 ECH-B 2374 FP-SPLIT=DSFOUR,STEP-PATT=7 1 326.4 S Comments: FeII (2374.46) ------------------------------------------------------------------------------------------------------------------------------------ 308 HD89688 HRS ACCUM 0.25 ECH-B 2852 FP-SPLIT=DSFOUR,STEP-PATT=7 1 761.6 S Comments: MgI (2852.96) ------------------------------------------------------------------------------------------------------------------------------------ 309 HD89688 HRS ACCUM 0.25 ECH-B 2600 FP-SPLIT=DSFOUR,STEP-PATT=7 1 544.0 S Comments: FeII (2600.17) ------------------------------------------------------------------------------------------------------------------------------------ 310 HD89688 HRS ACCUM 0.25 ECH-B 2064 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1632.0 Comments: ZnII (2062.66) CrII (2062.33, 2066.16) ------------------------------------------------------------------------------------------------------------------------------------ 311 HD89688 HRS ACCUM 0.25 ECH-B 2026 FP-SPLIT=DSFOUR,STEP-PATT=7 2 1088.0 Comments: ZnII (2026.14), MgI(2026.48) ------------------------------------------------------------------------------------------------------------------------------------ 312 HD89688 HRS ACCUM 0.25 ECH-B 1808 FP-SPLIT=DSFOUR,STEP-PATT=7 1 1088.0 Comments: SiII (1808.01) ------------------------------------------------------------------------------------------------------------------------------------ 313 HD89688 HRS ACCUM 0.25 ECH-B 2800 FP-SPLIT=DSFOUR,STEP-PATT=7 1 435.2 S Comments: MgII (2796.35 and 2803.53) ------------------------------------------------------------------------------------------------------------------------------------ 6723( 16) - 08/05/96 12:16 - [ 7] Summary Form for Proposal 6723 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE=3 BRIGHT=RETURN SEARCH-SIZE=5 STEP-PATT=7 FP-SPLIT=DSFOUR ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category INTERSTELLAR MEDIUM ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 102 ONBOARD ACQ FOR 103-111 ONBOARD ACQ FOR 202 ONBOARD ACQ FOR 219-226 ONBOARD ACQ FOR 302 ONBOARD ACQ FOR 303-313 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N1 ECH-A ECH-B ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD28497 HD89688 ------------------------------------------------------------------------------------------------------------------------------------