! File: 3022C.PROP ! Database: PEPDB ! Date: 18-FEB-1994:10:41:02 coverpage: title_1: SCIENCE ASSESSMENT OBSERVATIONS OF THE HG-RICH CP STAR CHI LUP sci_cat: STELLAR ASTROPHYSICS proposal_for: SAT/HRS pi_fname: DENNIS pi_mi: C. pi_lname: EBBETS pi_inst: BALL AEROSPACE SYSTEMS GROUP/GHRS pi_country: USA pi_phone: 301-338-1437 keywords_1: MS STAR, CHEMICALLY PECULIAR STAR, ABUNDANCE, keywords_2: SPECTROSCOPY, UV hours_pri: 1.50 num_pri: 1 pi_position: HRS CO-INVESTIGATOR ! end of coverpage abstract: line_1: The rich ultraviolet absorption spectrum of the ultra-sharp- line_2: lined, chemically peculiar star, chi Lup, will be used to line_3: ascertain fundamental performance properties of the combined line_4: OTA/GHRS in the 1900-2000 angstrom region and will provide line_5: important scientific information about the origin of abundance line_6: and isotopic anomalies of Hg in the star's photosphere. line_7: Intercomparison of high (R=85000) and medium (R=28000) dispersion line_8: spectra, centered on the Hg II resonance line at 1942 angstroms, line_9: will be obtained in both science apertures to assess the following: line_10: 1. spectral resolution, 2. effects of echelle mode scattered line_11: light background, photocathode graularity, etc., on the photometric line_12: accuracy of the data, 3. overall OTA/GHRS instrumental profile line_13: 4. performance of on-board doppler velocity compensation, 5. line_14: preservation of information content in deconvolved spectra, line_15: and 6. relative throughput of small and large apertures. line_16: A single, accurate observation of the Hg II resonance line at line_17: 1942 A can directly verify or refute the optical region, 3984 A, line_18: claim of an extraordinary Hg isotope anomaly in chi Lup, and line_19: yield a more accurate Hg/H abundance ratio, providing information line_20: about the origin of this type of abundance anomaly. ! ! end of abstract general_form_proposers: lname: EBBETS fname: DENNIS mi: C. inst: BASG country: USA ! lname: LECKRONE fname: DAVID mi: S. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! lname: WAHLGREN fname: GLENN mi: M. inst: COMPUTER SCIENCES CORP/GHRS country: USA ! ! end of general_form_proposers block general_form_text: question: 4 section: 1 line_1: line_3: Described under 2. above and in the HRS proposal. ! question: 7 section: 1 line_1: line_4: Data will be analysed at GSFC. Model atmospheres and synthetic line_5: spectra will be computed with ATLAS-based codes currently running on line_6: the IBM3081 and VAX computers at the GSFC. ! question: 10 section: 1 line_1: line_4: All funded support will be obtained through direct transfer of funds from ST line_5: Project. In-house facilities for data analysis are described in 7. above. ! question: 13 section: 1 line_1: line_3: High dispersion (R=85,000) and intermediate dispersion line_4: (R=28,000) HRS spectra will be utilized to establish Hg/H line_5: in the sharp-lined chemically peculiar star chi Lup, and to line_6: verify or refute the highly anomolous Hg isotope mixture in line_7: this star. We will also assess the performance capabilities line_8: of the OTA/GHRS. ! !end of general form text general_form_address: lname: EBBETS fname: DENNIS mi: C. category: PI inst: BALL AEROSPACE SYSTEMS GROUP addr_1: @STSCI city: BALTIMORE state: MD zip: 21818 country: USA phone: 301-338-1437 ! lname: LECKRONE fname: DAVID mi: S. inst: NASA, GODDARD SPACE FLIGHT CENTER addr_1: CODE 681 city: GREENBELT state: MD zip: 20771 country: USA phone: 301-286-8904 telex: 89675 ! lname: WAHLGREN fname: GLENN mi: M. inst: CSC @ NASA-GODDARD SPACE FLIGHT CENTER addr_1: CODE 681 city: GREENBELT state: MD zip: 20771 country: USA phone: 301-286-4533 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD141556 name_2: CHI-LUP descr_1: BP HG MN STAR pos_1: RA=15H 47M 46.468S +/- 0.2", pos_2: DEC=-33D 28' 35.36" +/- 0.2" equinox: 1950 pm_or_par: Y pos_epoch_yr: 1950.00 ra_pm_val: -0.000600 ra_pm_unct: 0.000667 dec_pm_val: -0.0320 dec_pm_unct: 0.0100 rv_or_z: V=+5 fluxnum_1: 1 fluxval_1: V=3.95+/-.05, TYPE=BP fluxnum_2: 2 fluxval_2: F-CONT(1942)=1.85 E-10 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 10.000 targname: HD141556 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 1325S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: MAP=ALL-POINTS, param_2: SEARCH-SIZE=5, req_1: INT ACQ FOR 10.5; req_2: CYCLE 0 / 10-13 ! linenum: 10.500 targname: HD141556 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 53S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: MAP=END-POINT, param_2: SEARCH-SIZE=1, param_3: LOCATE=NO req_1: ONBOARD ACQ FOR 11-11.5 comment_1: MAP LSA AFTER CENTERING SLEW ! linenum: 11.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 2.0 sp_element: G160M wavelength: 1942 num_exp: 1 time_per_exp: 330S s_to_n: 100 fluxnum_1: 2 priority: 1 param_1: STEP-PATT=5, param_2: FP-SPLIT=STD req_1: SEQ 11-13 NO GAP comment_1: 3 COMB CYCLES ! linenum: 11.500 targname: HD141556 config: HRS opmode: ACQ/PEAKUP aperture: 0.25 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 9.2S priority: 1 req_1: ONBOARD ACQ FOR 12-13 ! linenum: 12.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1942 num_exp: 1 time_per_exp: 990S s_to_n: 100 fluxnum_1: 2 priority: 1 param_1: STEP-PATT=5 param_2: FP-SPLIT=STD comment_1: 9 COMB CYCLES ! linenum: 13.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B29 wavelength: 1942 num_exp: 2 time_per_exp: 1640S s_to_n: 100 fluxnum_1: 2 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: 15 COMB CYCLES ! ! end of exposure logsheet ! No scan data records found