!  File:  5457_fix2.prop
!  Date:  23-MAY-1994
!  Ray Lucas

coverpage:

  title_1:         MEASUREMENT OF ATOMIC DEUTERIUM AND MOLECULAR HYDROGEN
    title_2:       6.7 BILLION YEARS AGO IN GAS OF LOW METALLICITY - CYCLE 4 HIGH
    sci_cat:       QUASARS & AGN
    sci_subcat:    QUASAR ABSORPTION
    proposal_for:  GO
    pi_title:      DR.
    pi_fname:      FRANK
    pi_mi:         H.
    pi_lname:      BRIGGS
    pi_inst:       UNIVERSITY OF PITTSBURGH
    pi_country:    USA
    pi_phone:      (412) 624-9012
    keywords_1:    ABSORPTION LINES
    hours_pri:     12.20
    num_pri:       1
    hrs:           Y
    pi_position:   PROFESSOR
    off_fname:     MICHAEL
    off_mi:        M.
    off_lname:     CROUCH
    off_title:     DIRECTOR
    off_inst:      UNIVERSITY OF PITTSBURGH
    off_addr_1:    OFFICE OF RESEARCH
    off_addr_2:    350 THACKERAY
    off_city:      PITTSBURGH
    off_state:     PA
    off_zip:       15260
    off_country:   USA
    off_phone:     412-624-7400
! end of coverpage

abstract:

    line_1:        GHRS observations of the z=0.692 absorption-line system observed
    line_2:        in the spectrum of the quasar 3C286 will provide a determination
    line_3:        of the deuterium abundance in relatively un-enriched gas as it
    line_4:        was when the Universe was about one half its current age. The
    line_5:        observation may produce the second detection of molecular hydrogen
    line_6:        in a high redshift absorption system.

!
! end of abstract

general_form_proposers:

  lname:           BRIGGS
    fname:         FRANK
    title:         PI
    mi:            H.
    inst:          UNIVERSITY OF PITTSBURGH
    country:       USA

!

  lname:           TURNSHEK
    fname:         DAVID
    mi:            A.
    inst:          UNIVERSITY OF PITTSBURGH
    country:       USA

!

  lname:           KHERSONSKY
    fname:         VALERY
    mi:            K.
    inst:          UNIVERSITY OF PITTSBURGH
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        The observational goal is to obtain a single GHRS G160M
    line_2:        spectrum of the QSO 3C286 at a resolution R=20,000 with
    line_3:        signal-to-noise ratio of about 7 per resolution element.
    line_4:        The wavelength interval observed will be 1540-1576 Ang.
    line_5:        The SSA will be used and the exposure time will be about
    line_6:        12 hours. 
    line_7:        NOTE: Please set FLYLIM=2 for this program. This will
    line_8:        apparently require the use of special commanding by STScI.
    line_9:        On the basis of advice we have gotten from Thanassis 
    line_10:       Diplas who works with the GHRS team, for a step time of 
    line_11:       200 msec ( which we requested and which is realistically
    line_12:       the minimum for using FP-SPLIT ), we have requested the use 
    line_13:       of FLYLIM, thus:
    line_14:       FLYLIM=2 ( i.e. OTFA=3)
    line_15:       NOTE: OTFA ( on the fly adder) is the REJLIM number, with
    line_16:       ( REJLIM = FLYLIM + 1 ), therefore in the 200 msec step 
    line_17:       time we will want to accept frames with <=2 and reject those 
    line_18:       with >=3. 
    line_19:       We also understood from the calibration meeting last fall that
    line_20:       we would be better off if the individual exposures were of 4 
    line_21:       or 5 minute duration rather than the 10 minute duration in our
    line_22:       original Phase II submission. So we are increasing the number of
    line_23:       exposures from 70 to 175, and decreasing the time per exposure 

!

  question:        3
    section:       2
    line_1:        from 10 minutes to 4 minutes. This should give us more freedom to 
    line_2:        eliminate small amounts of corrupted data.
    line_3:        
    line_4:        Based on information from the GHRS Instrument Scientist Dave 
    line_5:        Soderblom, it is our understanding that the exposure time padding
    line_6:        involved in the use of FLYLIM is not charged to the GO nor is it
    line_7:        necessary to change any of the exposure times in the program, so
    line_8:        this is, in effect, an invisible overhead as far as the GO is 
    line_9:        concerned.
    line_10:       
    line_11:       We have also revised our acquisition strategy based on advice from 
    line_12:       Dave Soderblom, and have corrected some errors ( incorrect mirror, 
    line_13:       etc. ) which appeared in our original Phase II submission. We had
    line_14:       also asked for 100s step time for the acquisitions in our original
    line_15:       submission, but Dave Soderblom has informed us that 12.75s is the
    line_16:       maximum allowable step time, so we have changed the step time to
    line_17:       12.75s for both the acquisition Exp Log lines, 1 and 2. ( Note that
    line_18:       we had originally expected 1200 counts in a 100 sec step time. )

!

  question:        4
    section:       1
    line_1:        Using the HRS G160M mode and SSA aperture, an exposure time of
    line_2:        12H is required to obtain a spectrum with a signal-to-noise
    line_3:        ratio of 7 per resolution element at the expected position of
    line_4:        the deuterium lines. With the aperture we propose to use the
    line_5:        resolution with be R=20000 which is 4 pixels in 1/4-diode
    line_6:        substepping mode (or 0.08 Angstroms resolution).  The 1-sigma
    line_7:        error in an absorption line equivalent width measurement will be
    line_8:        approximately 0.01 Angstrom (observed-frame).

!

  question:        5
    section:       1
    line_1:        Please set FLYLIM=2. We are told that this will require special 
    line_2:        commanding by STScI.

!

  question:        6
    section:       1
    line_1:

!

  question:        7
    section:       1
    line_1:        The data will be reduced and processed on SUN workstations
    line_2:        using the software available in IRAF/STSDAS when possible.
    line_3:        The deuterium lines will be analyzed both by profile
    line_4:        fitting and by computing  equivalent widths and performing
    line_5:        curve of growth analyses. This will produce a measure of
    line_6:        the column density of deuterium in the absorber at
    line_7:        z=0.692.
    line_8:        If molecular hydrogen is detected, synthetic spectra will
    line_9:        be computed and the data will be analyzed to extract values
    line_10:       for the column density, Doppler parameter, and excitation
    line_11:       temperature.
    line_12:       Measurements of the column density of atomic HI are needed
    line_13:       for comparison with the DI and H2 column densities; the HI
    line_14:       column density can be obtained either from the published
    line_15:       finding of the GTO team or by analyzing FOS spectra that
    line_16:       will be in the HST archives.

!

  question:        9
    section:       1
    line_1:

!

  question:        10
    section:       1
    line_1:        Institutional support includes academic year salary for the PI
    line_2:        and some administrative help.

!
!end of general form text

general_form_address:

  lname:           BRIGGS
    fname:         FRANK
    mi:            H.
    title:         DR.
    category:      PI
    inst:          UNIVERSITY OF PITTSBURGH
    addr_1:        DEPT. OF PHYS. AND ASTRON.
    city:          PITTSBURGH
    state:         PA
    zip:           15260
    country:       USA
    phone:         (412) 624-9015/9000

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        3C286
    descr_1:       E,313,323
    pos_1:         RA= 13H 31M 08.29S +/-  1",
    pos_2:         DEC= 30D 30' 32.9" +/- 1"
    equinox:       2000
    rv_or_z:       Z=0.849
    comment_1:     Z_ABS=0.6924
    comment_2:     POS FROM EARLIER FOS OBS
    comment_3:     (ROOTNAME: Y0PL0101T)
    fluxnum_1:     1
    fluxval_1:     V=17.3 +/- 0.2

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      3C286
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  114.75S
    s_to_n:        35
    fluxnum_1:     1
    priority:      1
    param_1:       BRIGHT=RETURN
    req_1:         CYCLE 4;
    req_2:         ONBOARD ACQ FOR 2;
    comment_1:     STEP-TIME=12.75S

!

    linenum:       2.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       3.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       4.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       5.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       6.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       7.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!

    linenum:       8.000
    targname:      3C286
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G160M
    wavelength:    1558
    num_exp:       25
    time_per_exp:  4M
    s_to_n:        7
    fluxnum_1:     1
    priority:      1
    param_1:       STEP-PATT=DEF,
    param_2:       STEP-TIME=0.2,
    param_4:       COMB=FOUR,
    param_5:       CENSOR=NO,
    param_6:       DOPPLER=ON,
    param_7:       FLYLIM=2,
    req_1:         CYCLE 4;

!
! end of exposure logsheet

! No scan data records found