6322( 7) - 08/03/95 20:42 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6322 Version: 7 Check-in Date: ********** 1.Proposal Title: Weak interstellar lines in the spectrum of Xi Persei ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GTO/HRS 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dennis Ebbets Ball Aerospace and Communications Group CoI: Jason Cardelli Villanova University N ------------------------------------------------------------------------------------ 6. Abstract This proposal defines observations of two wavelengths in the interstellar spectrum of Xi Persei. Both are made with Echelle B, and will achieve signal to noise ratios near 500 per data point. The spectral regions include weak interstellar absorption lines of C II and Si II that have not been detected in GHRS data with lower resolution and signal to noise. ------------------------------------------------------------------------------------ Observations Description ------------------------ Lines 10 - 20 define a standard GHRS onboard target acquisition, with an RTB search and double locate in the Large Science Aperture. With an integration period (step time) of 0.2 sec, the counter will not saturate even with a bright star and mirror A2. The spectra will be taken with the star in the 2.0 LSA. Lines 100 - 110 and 200 - 210 accumulate the spectra of the two wavelength regions. Each region is observed at two independent central wavelengths, with a standard four step FP-SPLIT sequence at each. The eight subexposures will each accumulate enough counts for a S/N = 180, and will reach approximately 500 when fully merged. We expect to detect lines as weak as 0.1 milli-Angstrom equivalent width. Real Time Justification ----------------------- No real-time resources are requested. Calibration Justification ------------------------- No special calibrations are requested. Additional Comments ------------------- ------------------------------------------------------------------------------------ 6322( 7) - 08/03/95 20:42 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: GHRS IDT at Goddard Space Flight Center Ship Via: GHRS team will Email: hrsake@hrs.gsfc.nasa.gov , ------------------------------------------------------------------------------------ 6322( 7) - 08/03/95 20:42 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD24912 ISM, Absorption Line RA=3H 58M 57.8S +/- 0.5S, 2000 V=4.04 System DEC=35D 47' 28.0" +/- 0.5" F-CONT(2330)=3.3E-10 6322( 7) - 08/03/95 20:42 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD24912 HRS ACQ 2.0 MIRROR-A2 SEARCH-SIZE=5, 1 5S ONBOARD ACQ FOR 20 BRIGHT=RETURN Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 20 HD24912 HRS ACQ/PEA 2.0 MIRROR-A2 1 20.4S ONBOARD ACQ FOR 100-210 KUP Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 100 HD24912 HRS ACCUM 2.0 ECH-B24 2325.0 STEP-PATT=6, FP 1 1209.6S -SPLIT=STD Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 110 HD24912 HRS ACCUM 2.0 ECH-B24 2325.8 STEP-PATT=6, FP 1 1209.6S -SPLIT=STD Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 200 HD24912 HRS ACCUM 2.0 ECH-B24 2335.0 STEP-PATT=6, FP 1 1209.6S -SPLIT=STD Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 210 HD24912 HRS ACCUM 2.0 ECH-B24 2335.8 STEP-PATT=6, FP 1 1209.6S -SPLIT=STD Comments: STEP-TIME=0.2S ------------------------------------------------------------------------------------------------------------------------------------ 6322( 7) - 08/03/95 20:42 - [ 5] Summary Form for Proposal 6322 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE=5 BRIGHT=RETURN FP-SPLIT=STD STEP-PATT=6 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GTO/HRS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 100-210 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-A2 ECH-B24 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD24912 ------------------------------------------------------------------------------------------------------------------------------------