! File: 4826C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:05:08:37 coverpage: title_1: INTERSTELLAR LEAD sci_cat: INTERSTELLAR MEDIUM proposal_for: GO/DD pi_title: PROF. pi_fname: L. pi_mi: M. pi_lname: HOBBS pi_inst: CHICAGO, UNIVERSITY OF pi_country: USA pi_phone: (414) 245-5555 keywords_1: INTERSTELLAR CLOUDS hours_pri: 1.37 num_pri: 1 hrs: Y funds_length: 12 funds_date: JUL-91 pi_position: PROFESSOR off_fname: JOYCE off_lname: FREEDMAN off_title: ASST. VICE PRES. off_inst: THE UNIVERSITY OF CHICAGO off_addr_1: 970 E. 58TH ST. off_city: CHICAGO off_state: IL off_zip: 60637 off_country: USA off_phone: (312) 702-8604 off_telex: 282-131 ! end of coverpage abstract: line_1: WE PROPOSE TO USE THIS DIRECTOR'S DISCRETIONARY TIME TO line_2: SEARCH FOR INTERSTELLAR ABSORPTION BY GASEOUS INTERSTELLAR line_3: LEAD IN THE SPECTRUM OF 1 SCO. IN OUR CYCLE 1 DATA FROM line_4: PROGRAM 3993, WE HAVE ALREADY SIMILARLY DETECTED INTER- line_5: STELLAR TIN TOWARD THE SAME STAR. AT Z=50, TIN IS BY FAR line_6: THE HEAVIEST ELEMENT YET DETECTED IN THE INTERSTELLAR line_7: MEDIUM, AND, AT Z=82, LEAD IS STILL MUCH HEAVIER. ON QUITE line_8: FIRM GROUNDS, WE EXPECT THE 1433 A LINE OF PB II TO ATTAIN A line_9: A STRENGTH OF ABOUT 3 MA TOWARD 1 SCO, OR ABOUT 70% OF THAT line_10: OF THE SN II 1400 A LINE WHICH WE HAVE PREVIOUSLY DETECTED. line_11: SUCH A PB II LINE SHOULD BE READILY DETECTED IN THE SINGLE line_12: SPECTRAL EXPOSURE WHICH CONSTITUTES THIS PROGRAM. ! ! end of abstract general_form_proposers: lname: HOBBS fname: L. title: P.I. mi: M. inst: CHICAGO, UNIVERSITY OF country: USA ! lname: MORTON fname: D. title: DR. mi: C. inst: HERZBERG INSTITUTE OF ASTROPHYSICS country: CANADA ! lname: SPITZER JR. fname: L. title: DR. inst: PRINCETON UNIVERSITY country: USA ! lname: WELTY fname: D. title: DR. mi: E. inst: CHICAGO, UNIVERSITY OF country: USA ! lname: YORK fname: D. title: DR. mi: G. inst: CHICAGO, UNIVERSITY OF country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: FOR ONE STAR, ONE GHRS EXPOSURE IS TO BE OBTAINED THROUGH line_2: THE SMALL SCIENCE APERTURE IN THE ACCUMULATION MODE, WITH THE line_3: 160M GRATING. THE EXPOSURE IS CENTERED AT 1425 A, BUT THE line_4: PB II LINE AT 1433 A IS OF PRIMARY IMPORTANCE. THE FP-SPLIT line_5: OPTION IS ADOPTED, TO ENHANCE THE LIKELIHOOD OF DETECTING line_6: A WEAK LINE. ! question: 4 section: 1 line_1: THE PROPOSED SCIENTIFIC PROGRAM CANNOT BE CARRIED OUT WITH line_2: ANY OTHER EXISTING TELESCOPE AND SPECTROGRAPH. THE HIGHEST line_3: POSSIBLE SPECTRAL RESOLVING POWER AND S/N RATIO ARE REQUIRED line_4: TO ACHIEVE A DETECTION OF THE EXPECTED VERY WEAK, NARROW line_5: LINE. ! question: 5 section: 1 line_1: THE EXPOSURE TIME REQURIED FOR THE ONE GHRS EXPOSURE IS GIVEN line_2: BELOW IN THE EXPOSURE LOGSHEET. OBSERVED, ABSOLUTE FLUXES line_3: MEASURED AT 1400 AND 1450 ANGSTROMS HAVE BEEN PUBLISHED FOR line_4: 1 SCO IN THE UV BRIGHT-STAR SPECTROPHOTOMETRIC CATALOGUE OF line_5: CATALOGUE OF JAMAR ET AL (1976). THE ABSOLUTE SENSITIVITY OF line_6: THE GHRS IS GIVEN IN THE GHRS INSTRUMENT HANDBOOK. THIS line_7: COMBINATION ALLOWS STRAIGHTFORWARD ESTIMATES OF THE REQUIRED line_9: EXPOSURE TIME. IN ADDITION, WE HAVE RECEIVED OUR CYCLE 1 line_10: DATA (PROGRAM ID=3993) FOR VERY SIMILAR EXPOSURES OF THE line_11: OF THE SAME STARS AT ADJACENT WAVELENGTHS, WHICH CONFIRM THE line_12: CALCULATED EXPOSURE TIMES DIRECTLY. ! question: 7 section: 1 line_1: WE WILL USE THE CALIBRATED SCIENCE DATA WHICH ARE PROVIDED line_2: AS THE OUTPUT OF THE ROUTINE SCIENCE DATA PROCESSING AND THE line_3: CALIBRATION DATA BASE SOFTWARE, AT THE ST ScI. SINCE WE WILL line_4: ANALYZE IN DETAIL ONLY ABSORPTION LINE PROFILES, WE DO NOT line_5: REQUIRE PRECISE INFORMATION ABOUT THE ABSOLUTE FLUXES. THE line_6: REDUCTIONS WILL BE CARRIED OUT USING IRAF/STSDAS, PRIMARILY. ! question: 10 section: 1 line_1: EXTENSIVE DATA-ANALYSIS CAPABILITIES WHICH ARE TAILORED line_2: PRECISELY FOR THIS KIND OF OBSERVATIONAL DATA AND ITS line_3: INTERPRETATION EXIST AT, AND WILL BE MADE AVAILABLE BY, line_4: OUR HOME INSTITUTIONS. ! !end of general form text general_form_address: lname: HOBBS fname: L. mi: M. title: PROF. category: PI inst: UNIVERSITY OF CHICAGO addr_1: YERKES OBSERVATORY city: WILLIAMS BAY state: WI zip: 531910258 country: USA ! ! end of general_form_address records fixed_targets: targnum: 14 name_1: HD141637 name_2: 1 SCO descr_1: A,110 pos_1: RA= 15H 47M 57.94S +/- 0.01S, pos_2: DEC= -25D 36' 03.0" +/- 0.1" equinox: 1950 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.001478 dec_pm_val: -0.0270 an_prlx_val: 0.0050 an_prlx_unct: 0.0050 rv_or_z: V= +03 fluxnum_1: 1 fluxval_1: V=4.68+/-0.02, TYPE=B2.5V, E(B-V)=0.16 fluxnum_2: 2 fluxval_2: F-CONT(1480)=7.27 E-10 fluxnum_3: 3 fluxval_3: F-CONT(1600)=5.65 E-10 fluxnum_4: 4 fluxval_4: F-CONT(2000)=2.96 E-10 fluxnum_5: 5 fluxval_5: F-CONT(2400)=2.17 E-10 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 306.000 sequence_1: DEFINE 162 targname: # config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1425.0 num_exp: 1 time_per_exp: 9.6M s_to_n: # fluxnum_1: 3 priority: # param_1: FP-SPLIT=DSFOUR param_2: STEP-PATT=5 comment_1: GA II, PB II; comment_2: 1.2MX2(SAMPL)X4(S/N=200) ! linenum: 714.100 targname: HD141637 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 5S s_to_n: 95 fluxnum_1: 3 priority: 1 param_1: SEARCH-SIZE=5 param_2: BRIGHT=RETURN param_3: LOCATE=YES req_1: ONBOARD ACQ FOR 714.2; req_2: SEQ 714.1-714.4 NO GAP; req_3: CYCLE 2 / 714.1-714.4 comment_1: STEP-TIME = 0.2 SEC ! linenum: 714.200 targname: HD141637 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 9.2S fluxnum_1: 3 priority: 1 req_1: ONBOARD ACQ FOR 714.3-714.4 comment_1: STEP-TIME = 0.2 SEC ! linenum: 714.300 targname: HD141637 config: HRS opmode: IMAGE aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 96.8S fluxnum_1: 3 priority: 1 param_1: NX=16,NY=16 comment_1: STEP-TIME = 0.2 SEC; comment_2: TAKE MAP AFTER CENTERING ! linenum: 714.400 sequence_1: USE 162 targname: HD141637 time_per_exp: X1.59 s_to_n: 200 priority: 1 ! ! end of exposure logsheet ! No scan data records found