! File: 3941C.PROP ! Database: PEPDB ! Date: 20-FEB-1994:00:56:17 coverpage: title_1: PHYSICAL PARAMETERS IN THE LOCAL INTERSTELLAR MEDIUM title_2: CYCLE 2 sci_cat: INTERSTELLAR MEDIUM proposal_for: GTO/HRS cont_id: 1201 pi_fname: ANDREW pi_mi: M. pi_lname: SMITH pi_inst: NASA, GODDARD SPACE FLIGHT CENTER pi_country: USA pi_phone: (301) 286- 3900 keywords_1: HI CLOUD, GAS hours_pri: 0.83 num_pri: 4 pi_position: STAFF ASTRONOMER ! end of coverpage abstract: line_1: Using the 10 (super 5) resolving power mode of the HRS it is proposed to line_2: observe neutral as well as multiply ionized species in the local interstellar line_3: medium at distances less than 50 pc from the Sun. The primary goal is to line_4: determine local hydrogen atom densities using fine structure populations in line_5: carbon and silicon atoms. Other goals are to determine electron densities from line_6: the populations of fine structure levels in C (super +) and S (super +) ions line_7: and to set limits on local gas temperatures by combining observations of line line_8: profiles, doppler parameters and ionization equilibria in atoms and first ions line_9: of carbon, silicon and magnesium. ! ! end of abstract general_form_proposers: lname: SMITH fname: ANDREW mi: M. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: The observations involve pointing at first and second magnitude stars and line_2: recording spectra with the HRS used in the echelle modes. The exposure times line_3: range from seconds to about 11 minutes. Signal to noise ratios in the continua line_4: are large, i.e. ~316, in order to obtain significant interstellar line depth to line_5: noise characteristics. Maximum count rates will be on the order of 1000 counts line_6: diode -1s-1. A wavelength calibration before each contiguous set of exposures line_7: is required. An attempt will be made to minimize fixed pattern noise, line_8: particularly when using the D1 detector, by subdividing an exposure into 4 line_9: parts corresponding to carrousel increments of about 5.2 pixels. line_11: Star HD10114 HD159561 HD209952 HD177724 line_13: Cycle exposures exposures exposures exposures line_15: 0 1-12 line_17: 1 13-58 line_19: 3 59-82 ! question: 3 section: 2 line_1: CONTINUATIONS OF COMMENTS FROM EXPOSURE LOGSHEETS-- line_3: 23. WAVELENGTH SCALE OFF-SETS. line_5: 24. NOISE SIDE OF DETECTOR 1. line_7: 31. LOW NOISE SIDE OF DETECTOR 1. line_9: 48. SIDE OF DETECTOR 1. line_12: Comment continued from TF target number 1: 20 F(1250)=5.37 E-9 line_13: 21 F(2343)=2.56 E-9 22 F(2586)=1.87 E-9 23 F(2599)=1.83 E-9 line_15: Comment continued from TF target number 4: 20 F(2343)=1.08 E-8 line_16: 21 F(2585)=7.81 E-9 22 F(2599)=7.65 E-9 ! question: 4 section: 1 line_1: Both the "Copernicus" and IUE satellites have provided considerable line_2: understanding of the local interstellar medium. However, the ST/HRS resolution line_3: in the echelle modes together with its high sensitivity enable observations of line_4: weak, narrow lines which could not be attempted by either of its predecessors. line_5: Component velocity discrimination on the order of 1.5 km s-1 as well as line_6: measurements of submilliangstrom equivalent widths of resonant lines in the line_7: critical species of carbon, silicon and magnesium are possible. Abundant line_8: species with resonance lines in the VUV are required since the atomic line_9: interstellar lines are expected to be very weak. ! question: 6 section: 1 line_1: Accurate absolute component velocities are required to establish line_2: correspondences between HRS measurements and other data. Accurate radial line_3: velocities will help in finding the geometrical characteristics of the clouds. line_4: Since many of the lines in neutral species will be weak, i.e., at the line_5: milliangstrom level, accurate pixel to pixel corrections must be made. ! question: 7 section: 1 line_1: While some data reduction processes can be considered reasonably well line_2: understood it is not entirely clear how sufficiently accurate flat field line_3: corrections will be made. Smoothing pixel to pixel variations in response can line_4: be accomplished to some unknown degree by incrementing the caroussel by some line_5: small amount during each exposure. The reduced data will be in the form of line_6: component velocities and column densities. Using collision cross sections and line_7: other standard analytical techniques hydrogen atom densities, electron line_8: densities, and temperatures will be found for as many different cloud line_9: components as possible. Some geometrical information will be forthcoming from line_10: the modest selection of stars in the proposal. Both visual and radio data will line_11: be required to maximize the scientific results which can be derived from the UV line_12: data. ! question: 10 section: 1 line_1: The necessary computing facilities are supplied by the Goddard Space Flight line_2: Center. ! question: 13 section: 1 line_1: It is proposed to observe neutral as well as multiply ionized species in the line_2: local interstellar medium using the echelle modes of the ST/HRS. The primary line_3: goal is to determine cloud component densities through measurements of fine line_4: structure level populations. An attempt will be made to determine cloud line_5: component temperatures and geometrical properties as well. ! !end of general form text general_form_address: lname: SMITH fname: ANDREW mi: M. category: PI inst: NASA, GODDARD SPACE FLIGHT CENTER city: GREENBELT state: MD zip: 20771 country: USA phone: (301) 286-3900 telex: 89675 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD209952 name_2: ALPHA-GRU descr_1: NEARBY STAR SHOWING INTERSTELLAR SPECTRUM pos_1: RA = 22H 5M 5.486S +/- 0.007S, pos_2: DEC = -47D 12' 14.54" +/- 0.10" equinox: 1950 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: 0.008667 ra_pm_unct: 0.000133 dec_pm_val: -0.1490 dec_pm_unct: 0.0020 an_prlx_val: 0.0570 rv_or_z: V=+12 comment_1: 11 F(1657)=5.15 E-9 comment_2: 12 F(1670)=5.13 E-9 comment_3: 13 F(1808)=4.25 E-9 comment_4: 14 F(1827)=4.25 E-9 comment_5: 15 F(2025)=3.47 E-9 comment_6: 16 F(2516)=2.07 E-9 comment_7: 17 F(2567)=1.92 E-9 comment_8: 18 F(2800)=1.25 E-9 comment_9: 19 F(2850)=1.11 E-9 fluxnum_1: 1 fluxval_1: V=1.73, TYPE = B5V, E(B-V)=0.0 fluxnum_2: 2 fluxval_2: F(1200)=2.13 E-9 fluxnum_3: 3 fluxval_3: F(1240)=6.02 E-9 fluxnum_4: 4 fluxval_4: F(1260)=4.53 E-9 fluxnum_5: 5 fluxval_5: F(1302)=3.26 E-9 fluxnum_6: 6 fluxval_6: F(1328)=5.53 E-9 fluxnum_7: 7 fluxval_7: F(1335)=3.54 E-9 fluxnum_8: 8 fluxval_8: F(1526)=5.43 E-9 fluxnum_9: 9 fluxval_9: F(1546)=5.33 E-9 fluxnum_10: 10 fluxval_10: F(1561)=5.34 E-9 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: HD209952 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 5.0S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE=5, param_2: BRIGHT=RETURN req_1: CYCLE 2/1-22; req_2: ONBOARD ACQ FOR 1.1 comment_1: STEP-TIME=0.2S ! linenum: 1.100 targname: ^ config: ^ opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 20.4S s_to_n: 10 fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 2-7 comment_1: STEP-TIME=0.2S ! linenum: 2.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1193.5 num_exp: 1 time_per_exp: 460.8S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 3.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1249.6 num_exp: 1 time_per_exp: 288.0S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 4.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1295.8 num_exp: 1 time_per_exp: 230.4S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 5.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1328.7 num_exp: 1 time_per_exp: 230.4S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 6.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1553.8 num_exp: 1 time_per_exp: 288.0S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 7.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1659.7 num_exp: 1 time_per_exp: 230.4S s_to_n: 351 fluxnum_1: 2 priority: 1 param_1: FP-SPLIT=STD, param_2: METER=NO, param_3: STEP-PATT=4 ! linenum: 12.000 targname: HD209952 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 5.0S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE=5, param_2: BRIGHT=RETURN req_2: ONBOARD ACQ FOR 12.1 comment_1: STEP-TIME=0.2S ! linenum: 12.100 targname: HD209952 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 20.4S s_to_n: 10 fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 13-22 comment_1: STEP-TIME=0.2S ! linenum: 13.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B31 wavelength: 1810 num_exp: 1 time_per_exp: 220S s_to_n: 316 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 13 ! linenum: 14.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B28 wavelength: 2027 num_exp: 1 time_per_exp: 220S s_to_n: 316 priority: 1 param_1: STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 13 ! linenum: 17.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B20 wavelength: 2799.1 num_exp: 1 time_per_exp: 108.8S s_to_n: 200 priority: 1 param_1: METER=NO, STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 18 ! linenum: 18.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B20 wavelength: 2854.83 num_exp: 1 time_per_exp: 220S s_to_n: 200 priority: 1 param_1: METER=NO, STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 19 ! linenum: 20.000 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: ECH-B24 wavelength: 2370.95 num_exp: 1 time_per_exp: 30S priority: 1 param_1: STEP-PATT=7, req_1: CALIB FOR 21 NO SLEW; req_2: SEQ 20-21 NON-INT; ! linenum: 21.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B24 wavelength: 2370.95 num_exp: 1 time_per_exp: 220S s_to_n: 200 priority: 1 param_1: METER=NO, STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 22 ! linenum: 22.000 targname: HD209952 config: HRS opmode: ACCUM aperture: 0.25 sp_element: ECH-B22 wavelength: 2596.4 num_exp: 1 time_per_exp: 217.6S s_to_n: 200 priority: 1 param_1: METER=NO, STEP-PATT=7, param_2: FP-SPLIT=STD comment_1: FLUX REF IS 22 ! ! end of exposure logsheet ! No scan data records found