! File: 1182C.PROP ! Database: PEPDB ! Date: 16-FEB-1994:05:00:49 coverpage: title_1: ELEMENTAL ABUNDANCES IN EARLY-TYPE STARS sci_cat: STELLAR ASTROPHYSICS proposal_for: GTO/HRS longterm: 2 pi_fname: DAVID pi_mi: S. pi_lname: LECKRONE pi_inst: NASA, GODDARD SPACE FLIGHT CENTER pi_country: USA pi_phone: 301-344-8904 keywords_1: MS STAR, HB STAR, CHEMICALLY PECULIAR STAR, ABUNDANCE, keywords_2: SPECTROSCOPY, UV hours_pri: 29.00 num_pri: 24 pi_position: HRS CO-INVESTIGATOR ! end of coverpage abstract: line_1: The resolving power and photometric quality of HRS data are exploited in an line_2: extensive investigation of the elemental abundances, atmospheric properties and line_3: evolutionary characteristics of sharp-lined B and A stars. Three classes of line_4: stars are included - chemically peculiar (CP) non-magnetic late B stars of the line_5: HgMn class, an early-A type horizontal branch star and sharp-lined normal stars line_6: ranging from B6 to A2. Analyses of the CP stars will establish constraints on line_7: models for the production of abundance anomalies. The field horizontal branch line_8: star's CNO abundances, obtained from low-excitation UV lines, will provide a line_9: critical check of abundances derived from high excitation transtions observed line_10: in the red and near-IR, the latter being susceptible to large non-LTE effects. line_11: Abundances obtained from the spectra of the normal stars provide a framework of line_12: comparison standards for the study of CP stars and allow us to place limits on line_13: star-to-star variations in abundance, perhaps reflecting local patterns of line_14: nucleosynthesis. The program is divided into seven research topics. The line_15: R=100,000 mode is used to investigate specific issues raised by previous line_16: studies. The R=20,000 mode is used to obtain complete UV spectra of selected line_17: CP and normal stars to be used for global abundance analyses. ! ! end of abstract general_form_proposers: lname: BRANDT fname: JOHN mi: C. inst: UNIVERSITY OF COLORADO country: USA ! lname: LECKRONE fname: DAVID mi: S. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! lname: CARPENTER fname: KENNETH mi: G. inst: NASA, GODDARD SPACE FLIGHT CENTER 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 the RDAF facility at GSFC. Model atmospheres and line_5: synthetic spectra will be computed with ATLAS-based codes currently running on line_6: the HRSVAX 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=100,000) HRS spectra will be utilized to survey B II line_4: lambda 1362 in large sample of HgMn stars, to explore the behavior of HgI, II line_5: and III in HgMn stars, to establish Hg/H in normal, sharp-lined B and A stars line_6: and to search for AuII lines in HgMn stars known to be rich in Pt and Hg. line_7: Complete medium dispersion (R=20,000) UV spectra will be obtained for selected line_8: CP and normal B and A stars for use (in conjunction with optical data) in line_9: exhaustive abundance analyses. Medium dispersion spectra will also line_10: be obtained of the low excitation CI, NI and OI lines in a relatively bright line_11: field horizontal branch star to establish CNO abundances. ! !end of general form text general_form_address: lname: LECKRONE fname: DAVID mi: S. category: PI inst: NASA, GODDARD SPACE FLIGHT CENTER addr_1: CODE 681 city: GREENBELT state: MD zip: 20771 country: USA phone: 301-344-8904 telex: 89675 ! ! end of general_form_address records fixed_targets: targnum: 2 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(1362)=1.8 E-10 fluxnum_3: 3 fluxval_3: F-CONT(2536)=1.1 E-10 fluxnum_4: 4 fluxval_4: F-CONT(1942)=1.8 E-10 fluxnum_5: 5 fluxval_5: F-CONT(1650)=2.0 E-10 fluxnum_6: 6 fluxval_6: F-CONT(1378)=1.8 E-10 fluxnum_7: 7 fluxval_7: F-CONT(1740)=2.0 E-10 fluxnum_8: 8 fluxval_8: F-CONT(1783)=1.9 E-10 fluxnum_9: 9 fluxval_9: F-CONT(2082)=1.7 E-10 fluxnum_10: 10 fluxval_10: F-CONT(1849)=1.9 E-10 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 53.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B wavelength: 1942 num_exp: 2 time_per_exp: 1096S s_to_n: 70 fluxnum_1: 4 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD req_1: CYCLE 0/53-55,60,115; req_2: SEQ 53-55,60,115 NO GAP ! linenum: 54.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B wavelength: 2536 num_exp: 1 time_per_exp: 876S s_to_n: 70 fluxnum_1: 3 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD ! linenum: 55.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: 1849 num_exp: 3 time_per_exp: 876S s_to_n: 50 fluxnum_1: 10 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD ! linenum: 60.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B wavelength: 2354 num_exp: 1 time_per_exp: 876S s_to_n: 70 fluxnum_1: 3 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD req_1: CYCLE 0 ! linenum: 115.000 targname: HD141556 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B wavelength: 1741.6 num_exp: 4 time_per_exp: 1312S s_to_n: 50 fluxnum_1: 7 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD req_1: CYCLE 0 ! linenum: 175.000 targname: HD141556 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 57.8S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE=5, param_2: FAINT=1900, param_3: MAP=END-POINT, param_4: LOCATE=NO req_1: ONBOARD ACQ FOR 175.001; req_2: CYCLE 0 comment_1: STEP-TIME=0.2 SEC ! linenum: 175.001 targname: HD141556 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 73.6S s_to_n: 10 fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 175.002; req_2: CYCLE 0 comment_1: STEP-TIME=1.6 SEC ! linenum: 175.002 targname: HD141556 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 97.0S s_to_n: ^ fluxnum_1: ^ priority: 1 param_1: SEARCH-SIZE=1, param_2: FAINT=0, param_3: MAP=END-POINT, param_4: LOCATE=NO req_1: ONBOARD ACQ FOR 175.003; req_2: CYCLE 0 comment_1: STEP-TIME=0.2 SEC comment_2: TAKE MAP AFTER CENTERING ! linenum: 175.003 targname: HD141556 config: ^ opmode: ACQ/PEAKUP aperture: 0.25 sp_element: MIRROR-A2 num_exp: ^ time_per_exp: 73.6S s_to_n: ^ fluxnum_1: ^ priority: 1 req_1: ONBOARD ACQ FOR 53-55,60,115; req_2: CYCLE 0 comment_1: STEP-TIME=1.6 SEC comment_2: USE ONLY IF SSA PEAKUP VALIDATED, comment_3: OTHERWISE REPLACE WITH SSA MAP ! ! end of exposure logsheet ! No scan data records found