Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3022c Report Date: 09-May-96:17:50 Version: ********** Check-in Date: ********** 1.Proposal Title: SCIENCE ASSESSMENT OBSERVATIONS OF THE HG-RICH CP STAR CHI LUP ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS SAT/HRS Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dennis C. Ebbets BALL AEROSPACE SYSTEMS GROUP USA 301-338-1437 HRS CO-INVESTIGATOR ------------------------------------------------------------------------------------ 7. Abstract The rich ultraviolet absorption spectrum of the ultra-sharp- lined, chemically peculiar star, chi Lup, will be used to ascertain fundamental performance properties of the combined OTA/GHRS in the 1900-2000 angstrom region and will provide important scientific information about the origin of abundance and isotopic anomalies of Hg in the star's photosphere. Intercomparison of high (R=85000) and medium (R=28000) dispersion spectra, centered on the Hg II resonance line at 1942 angstroms, will be obtained in both science apertures to assess the following: 1. spectral resolution, 2. effects of echelle mode scattered light background, photocathode graularity, etc., on the photometric accuracy of the data, 3. overall OTA/GHRS instrumental profile 4. performance of on-board doppler velocity compensation, 5. preservation of information content in deconvolved spectra, and 6. relative throughput of small and large apertures. A single, accurate observation of the Hg II resonance line at 1942 A can directly verify or refute the optical region, 3984 A, claim of an extraordinary Hg isotope anomaly in chi Lup, and yield a more accurate Hg/H abundance ratio, providing information about the origin of this type of abundance anomaly. ------------------------------------------------------------------------------------ 8. Scientific Key Words: MS STAR, CHEMICALLY PECULIAR STAR, ABUNDANCE, SPECTROSCOPY, UV ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.50 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3022c PI: Dennis C. Ebbets Proposal Title: SCIENCE ASSESSMENT OBSERVATIONS OF THE HG-RICH CP STAR CHI LUP ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dennis C. Ebbets BASG USA David S. Leckrone NASA, GODDARD SPACE FLIGHT USA CENTER Glenn M. Wahlgren COMPUTER SCIENCES CORP/GHRS USA ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Described under 2. above and in the HRS proposal. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Data will be analysed at GSFC. Model atmospheres and synthetic spectra will be computed with ATLAS-based codes currently running on the IBM3081 and VAX computers at the GSFC. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). All funded support will be obtained through direct transfer of funds from ST Project. In-house facilities for data analysis are described in 7. above. ------------------------------------------------------------------------------------ 13. High dispersion (R=85,000) and intermediate dispersion (R=28,000) HRS spectra will be utilized to establish Hg/H in the sharp-lined chemically peculiar star chi Lup, and to verify or refute the highly anomolous Hg isotope mixture in this star. We will also assess the performance capabilities of the OTA/GHRS. ------------------------------------------------------------------------------------ 11. Address Information Name: DENNIS C. EBBETS Category: PI Institution: BALL AEROSPACE SYSTEMS GROUP Address: @STSCI City: BALTIMORE State: MD Zip Code: 21818 Country: USA Telephone: 301-338-1437 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: DAVID S. LECKRONE Category: Institution: NASA, GODDARD SPACE FLIGHT CENTER Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: 301-286-8904 Telex (or e-mail): 89675 ------------------------------------------------------------------------------------ Name: GLENN M. WAHLGREN Category: Institution: CSC @ NASA-GODDARD SPACE FLIGHT C Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: 301-286-4533 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3022c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD141556 CHI BP HG MN STAR RA=15H 47M 46.468S +/- 0.2", 1950 V=+5 1 V=3.95+/-.05, TYPE=BP -LUP DEC=-33D 28' 35.36" +/- 0.2" 2 F-CONT(1942)=1.85 E-10 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1950.00 -0.0006 +/- 0.0007 -0.0320 +/- 0.0100 0.0000 +/- 0.0000 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3022c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 HD141556 HRS ACQ 2.0 MIRROR-A2 MAP=ALL-POINTS 1 1325S 10 1 1 INT ACQ FOR 10.5 SEARCH-SIZE=5 CYCLE 0 / 10-13 ------------------------------------------------------------------------------------------------------------------------------------ 10.5 HD141556 HRS ACQ 2.0 MIRROR-A2 MAP=END-POINT 1 53S 10 1 1 ONBOARD ACQ FOR 11 SEARCH-SIZE=1 -11.5 LOCATE=NO Comments: MAP LSA AFTER CENTERING SLEW ------------------------------------------------------------------------------------------------------------------------------------ 11 HD141556 HRS ACCUM 2.0 G160M 1942 STEP-PATT=5 1 330S 100 2 1 SEQ 11-13 NO GAP FP-SPLIT=STD Comments: 3 COMB CYCLES ------------------------------------------------------------------------------------------------------------------------------------ 11.5 HD141556 HRS ACQ/ 0.25 MIRROR-A2 1 9.2S 1 ONBOARD ACQ FOR 12 PEAKUP -13 ------------------------------------------------------------------------------------------------------------------------------------ 12 HD141556 HRS ACCUM 0.25 G160M 1942 STEP-PATT=5 1 990S 100 2 1 FP-SPLIT=STD Comments: 9 COMB CYCLES ------------------------------------------------------------------------------------------------------------------------------------ 13 HD141556 HRS ACCUM 0.25 ECH-B29 1942 STEP-PATT=7 2 1640S 100 2 1 FP-SPLIT=STD Comments: 15 COMB CYCLES ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3022c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ACQ/PEAKUP ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters MAP=ALL-POINTS SEARCH-SIZE=5 MAP=END-POINT SEARCH-SIZE=1 LOCATE=NO STEP-PATT=5 FP-SPLIT=STD STEP-PATT=7 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for SAT/HRS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.50 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements INT ACQ FOR 10.5; CYCLE 0 / 10-13 ONBOARD ACQ FOR 11-11.5 SEQ 11-13 NO GAP ONBOARD ACQ FOR 12-13 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-A2 G160M ECH-B29 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD141556 CHI-LUP ------------------------------------------------------------------------------------------------------------------------------------