!  File:  3215C.PROP
!  Database:  PEPDB
!  Date:  18-FEB-1994:22:13:19

coverpage:

  title_1:         COMPOSITION OF GAS IN INDIVIDUAL INTERSTELLAR CLOUDS:
    title_2:       CYCLE 1 OBSERVATIONS
    sci_cat:       INTERSTELLAR MEDIUM
    sci_subcat:    ABSORPTION LINES
    proposal_for:  GTO/OS
    cont_id:       1071
    pi_title:      PROF.
    pi_fname:      C.
    pi_mi:         R.
    pi_lname:      O'DELL
    pi_inst:       RICE UNIVERSITY
    pi_country:    USA
    pi_phone:      713-527-8101 EX3633
    keywords_1:    INTERSTELLAR LINES
    hours_pri:     10.00
    num_pri:       27
    hrs:           X
    pi_position:   PROF. SP.PHYS.ASTR.
! end of coverpage

abstract:

    line_1:        The observations requested for the one star in Cycle 1 form part of a program
    line_2:        in interstellar matter research, using the Goddard High Resolution Spectrograph
    line_3:        to obtain precise measures of ultraviolet interstellar absorption lines, using
    line_4:        the highest spectral resolution. For each star to be observed in this program,
    line_5:        column densities will be determined for atoms of 17 atomic species of 10
    line_6:        elements. These data will be analyzed to determine relative abundances in the
    line_7:        several individual clouds present along each line of sight, and thus to
    line_8:        determine how the composition of the gas in such clouds varies with cloud
    line_9:        parameters such as H column density, velocity, ionization level, and distance z
    line_10:       from the galactic plane. This information should help to clarify the
    line_11:       equilibrium between gas and grains, i.e., how the gas condenses on the grains
    line_12:       and how the grains are destroyed by a variety of phenomena occurring in
    line_13:       interstellar clouds.

!
! end of abstract

general_form_proposers:

  lname:           O'DELL
    fname:         C.
    mi:            R.
    inst:          RICE UNIVERSITY
    country:       USA

!

  lname:           SPITZER
    fname:         LYMAN
    inst:          PRINCETON UNIVERSITY
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        For the star to be observed in Cycle 1 a series of interstellar absorption
    line_2:        lines longwards of 1800 A will be observed, using the Echelle mode of the
    line_3:        Goddard High Resolution Spectrograph (GHRS) in the WSCAN mode.  Measures will be
    line_4:        made for each line with the spectrum located at three different positions on the
    line_5:        photocathode, to help correct for cathode non-uniformities. In addition, the
    line_6:        scattered light will be measured on each side of the spectrum, again in order to
    line_7:        achieve the maximum photometric precision. Lines betwen 1120 and 1600 A will be
    line_8:        observed with grating G160M of GHRS, using the FP-SPLIT routine to obtain
    line_9:        subexposures at four different photocathode positions.  For all lines observed a
    line_10:       substep routine, with offsets of 1/4 diode, will be used to achieve full
    line_11:       spectrophotometric accuracy.  The sequence of lines observed will differ
    line_12:       somewhat in the different program stars. Among the atomic species whose lines
    line_13:       will be observed in the Cycle 1 star are CI, CII, CIV, NI, NV, OI, SI, SII,
    line_14:       SIII, SiII, SiIV, MgI, MgII, PII, PIII, MnII, FeII, and Zn II.

!

  question:        4
    section:       1
    line_1:        This program requires measures of interstellar absorption lines produced by
    line_2:        atoms in their dominant stage of ionization, so that the relative abundances of
    line_3:        several chemical abundances can be intercompared, without any necessity for
    line_4:        ionization corrections. Only one such element has such lines (TiII) accessible
    line_5:        from the ground. Moreover, none of the highly ionized species, such as SIII
    line_6:        and PIII, which have low abundances in H I regions, can be observed from the
    line_7:        ground; observations of such ions are needed to ascertain which components of
    line_8:        interstellar lines are produced by H II regions.

!

  question:        7
    section:       1
    line_1:        While the numerical analysis required for this program is straightforward
    line_2:        in principle, the amount of data to be measured and analyzed is rather
    line_3:        large and many different effects, both instrumental and physical, must be
    line_4:        evaluated.  Dr. Edward L. Fitzpatrick has joined the Princeton staff as
    line_5:        Research Astronomer, full time, to undertake the systematic analysis of this
    line_6:        material, in close collaboration with L. Spitzer.

!

  question:        13
    section:       1
    line_1:        Interstellar lines will be observed at the highest possible resolution
    line_2:        with the GHRS in the spectra of about 10 stars, some at large distances from
    line_3:        the galactic plane, others in the galactic disk. The lines of elements such as
    line_4:        C, N, O, Mg, Si, P, S, Mn, Fe, and Zn will be resolved into components and the
    line_5:        composition determined. Dependence of depletion on the physical properties of
    line_6:        the components should help to clarify the equilibrium between dust grains and
    line_7:        the gas.

!
!end of general form text

general_form_address:

  lname:           SPITZER
    fname:         LYMAN
    category:      CON
    inst:          PRINCETON UNIV. OBSERVATORY
    addr_1:        PEYTON HALL
    city:          PRINCETON
    state:         NJ
    zip:           08544
    country:       USA
    phone:         609-258-3809
    telex:         322409

!

  lname:           O'DELL
    fname:         C.
    mi:            R.
    title:         PROF.
    category:      PI
    inst:          RICE UNIVERSITY
    addr_1:        DEPT. OF SPACE PHYSICS & ASTRONOMY
    addr_2:        P.O. BOX 1892
    city:          HOUSTON
    state:         TX
    zip:           77251
    country:       USA
    phone:         713-527-8101 X3633
    telex:         556457

!
! end of general_form_address records

fixed_targets:

    targnum:       22
    name_1:        HD147165
    name_2:        SIGMA-SCO
    descr_1:       B 113
    pos_1:         RA=16H18M8.67S +/- .1S,
    pos_2:         DEC=-25D28'28.6" +/- 1.0"
    equinox:       1950
    pm_or_par:     NO
    fluxnum_1:     1
    fluxval_1:     V=2.90,E(B-V)=0.38
    fluxnum_2:     2
    fluxval_2:     F-CONT(1300)=4.3+/-0.4E-9

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1148.0
    num_exp:       1
    time_per_exp:  616S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR
    req_1:         SEQ 1-7 NO GAP
    comment_1:     EXPOSURE TIME IN LINE 1 YIELDS S/N
    comment_2:     =61 PER 3 KM/S BIN PER SUBEXPOSURE
    comment_3:     FOR A STANDARD STAR WITH F-CONT(1300)
    comment_4:     =1.0E-8 USING MEASURED HST SENSITIVITY

!

    linenum:       2.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1195.0
    num_exp:       1
    time_per_exp:  287S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR
    comment_1:     EXPOSURE TIMES IN LINES 2-7 YIELD S/N
    comment_2:     =87 PER 3 KM/S BIN PER SUBEXPOSURE
    comment_3:     FOR A STANDARD STAR WITH F-CONT(1300)
    comment_4:     =1.0E-8 USING MEASURED HST SENSITIVITY

!

    linenum:       3.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1252.0
    num_exp:       1
    time_per_exp:  134S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR

!

    linenum:       4.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1315.6
    num_exp:       1
    time_per_exp:  107S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR

!

    linenum:       5.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1347.0
    num_exp:       1
    time_per_exp:  129S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR

!

    linenum:       6.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1392.0
    num_exp:       1
    time_per_exp:  164S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR

!

    linenum:       7.000
    sequence_1:    DEFINE
    sequence_2:    D-1A
    targname:      #
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G160M
    wavelength:    1560.0
    num_exp:       1
    time_per_exp:  233S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO,
    param_3:       FP-SPLIT=DSFOUR

!

    linenum:       8.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    1804.92-1807.08
    num_exp:       1
    time_per_exp:  186S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.72
    req_1:         SEQ 8-14 NO GAP
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 8 IS
    comment_2:     EQUIVALENT TO 8 CARROUSEL STEPS.
    comment_3:     EXPOSURE TIMES IN LINES 8-14 YIELD S/N
    comment_4:     =100 PER 3 KM/S BIN PER SUBEXPOSURE
    comment_5:     FOR A STANDARD STAR WITH F-CONT(1300)
    comment_6:     =1.0E-8 USING MEASURED HST SENSITIVITY

!

    linenum:       9.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    1825.95-1828.05
    num_exp:       1
    time_per_exp:  186S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.70
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 9
    comment_2:     IS EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       10.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2024.51-2026.79
    num_exp:       1
    time_per_exp:  81S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.76
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 10
    comment_2:     IS EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       11.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2058.36-2060.64
    num_exp:       1
    time_per_exp:  90S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.76
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 11
    comment_2:     IS EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       12.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2259.49-2262.10
    num_exp:       1
    time_per_exp:  45S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.87
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 12
    comment_2:     IS EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       13.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2370.71-2373.35
    num_exp:       1
    time_per_exp:  66S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.88
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 13
    comment_2:     IS EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       14.000
    sequence_1:    DEFINE
    sequence_2:    BR-3B
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2602.48-2605.27
    num_exp:       1
    time_per_exp:  105S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.93
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 14 IS
    comment_2:     EQUIVALENT TO 8 CARROUSEL STEPS.

!

    linenum:       15.000
    sequence_1:    DEFINE
    sequence_2:    C-2
    targname:      #
    config:        HRS
    opmode:        WSCAN
    aperture:      0.25
    sp_element:    ECH-B
    wavelength:    2322.49-2325.34
    num_exp:       1
    time_per_exp:  51S
    s_to_n:        #
    fluxnum_1:     2
    priority:      #
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO,
    param_3:       WAVE-STEP=0.95
    comment_1:     "WAVE-STEP" IN COLUMN 9 OF LINE 15 IS
    comment_2:     EQUIVALENT TO 8 CARROUSEL STEPS.
    comment_3:     EXPOSURE TIME IN LINE 15 YIELDS S/N
    comment_4:     =100 PER 3 KM/S BIN PER SUBEXPOSURE
    comment_5:     FOR A STANDARD STAR WITH F-CONT(1300)
    comment_6:     =1.0E-8 USING MEASURED HST SENSITIVITY

!

    linenum:       101.000
    targname:      HD147165
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-A2
    num_exp:       1
    time_per_exp:  57.8S
    priority:      2
    param_1:       FAINT=11600,
    param_2:       LOCATE=YES,
    param_3:       MAP=END-POINT, SEARCH-SIZE=5
    req_1:         ONBOARD ACQUISITION FOR 101.5;
    req_2:         CYCLE 1 / 101-105;
    comment_1:     STEP-TIME=0.2 SEC

!

    linenum:       101.500
    targname:      HD147165
    config:        HRS
    opmode:        ACQ/PEAKUP
    aperture:      2.0
    sp_element:    MIRROR-A2
    num_exp:       1
    time_per_exp:  9.2S
    priority:      2
    req_1:         ONBOARD ACQUISITION FOR 102-105;
    comment_1:     STEP-TIME=0.2 SEC

!

    linenum:       102.000
    targname:      WAVE
    config:        HRS
    opmode:        ACCUM
    aperture:      SC2
    sp_element:    G160M
    wavelength:    1190.5
    num_exp:       1
    time_per_exp:  40S
    priority:      2
    param_1:       STEP-PATT=5,
    param_2:       COMB=TWO

!

    linenum:       103.000
    sequence_1:    USE
    sequence_2:    D-1A
    targname:      HD147165
    time_per_exp:  X2.3
    s_to_n:        87
    priority:      2
    comment_1:     THE MULTIPLICATIVE FACTOR 2.3 FOR ALL
    comment_2:     D-1A EXPOSURES FOR THIS STAR HAS BEEN
    comment_3:     CALCULATED TO GIVE S/N=87 PER 3 KM/S
    comment_4:     BIN FOR EACH OF 4 SUBEXPOSURES FOR THE
    comment_5:     HRS SENSITIVITY AS MEASURED IN CYCLE 0

!

    linenum:       103.100
    targname:      HD147165
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-A2
    num_exp:       1
    time_per_exp:  57.8S
    priority:      2
    param_1:       FAINT=11600,
    param_2:       LOCATE=YES,
    param_3:       MAP=END-POINT, SEARCH-SIZE=5
    req_1:         ONBOARD ACQUISITION FOR 103.2;
    comment_1:     STEP-TIME=0.2 SEC

!

    linenum:       103.200
    targname:      HD147165
    config:        HRS
    opmode:        ACQ/PEAKUP
    aperture:      2.0
    sp_element:    MIRROR-A2
    num_exp:       1
    time_per_exp:  9.2S
    priority:      2
    req_1:         ONBOARD ACQUISITION FOR 103.5-105;
    comment_1:     STEP-TIME=0.2 SEC

!

    linenum:       103.500
    sequence_1:    USE
    sequence_2:    BR-3B
    targname:      HD147165
    time_per_exp:  X2.3
    s_to_n:        100
    priority:      2
    comment_1:     THE MULTIPLICATIVE FACTOR 2.3 FOR ALL
    comment_2:     BR-3B EXPOSURES FOR THIS STAR HAS BEEN
    comment_3:     CALCULATED TO GIVE S/N=100 PER 3 KM/S
    comment_4:     BIN FOR EACH OF 3 SUBEXPOSURES FOR THE
    comment_5:     HRS SENSITIVITY AS MEASURED IN CYCLE 0

!

    linenum:       104.000
    sequence_1:    USE
    sequence_2:    C-2
    targname:      HD147165
    time_per_exp:  X9.2
    s_to_n:        200
    priority:      2
    comment_1:     THE MULTIPLICATIVE FACTOR 9.2 FOR THE
    comment_2:     C-2 EXPOSURE FOR THIS STAR HAS BEEN
    comment_3:     CALCULATED TO GIVE S/N=200 PER 3 KM/S
    comment_4:     BIN FOR EACH OF 3 SUBEXPOSURES FOR THE
    comment_5:     HRS SENSITIVITY AS MEASURED IN CYCLE 0

!

    linenum:       105.000
    targname:      WAVE
    config:        HRS
    opmode:        ACCUM
    aperture:      SC2
    sp_element:    ECH-B
    wavelength:    2324.86
    num_exp:       1
    time_per_exp:  13.6S
    priority:      2
    param_1:       STEP-PATT=7,
    param_2:       COMB=TWO

!
! end of exposure logsheet

! No scan data records found