!  File:  1215C.PROP
!  Database:  PEPDB
!  Date:  16-FEB-1994:06:26:26

coverpage:

  title_1:         ULTRAVIOLET SPECTRAL ATLAS OF O STARS IN THE
    title_2:       MILKY WAY AND MAGELLANIC CLOUDS
    sci_cat:       STELLAR ASTROPHYSICS
    proposal_for:  GTO/HRS
    pi_fname:      SARA
    pi_mi:         R.
    pi_lname:      HEAP
    pi_inst:       NASA, GODDARD SPACE FLIGHT CENTER
    pi_country:    USA
    pi_phone:      301-286-5359
    keywords_1:    STELLAR WINDS, EXTENDED ATMOSPHERES
    hours_pri:     8.80
    num_pri:       8
    wf_pc:         Y
    hrs:           Y
! end of coverpage

abstract:

    line_1:        We will obtain high S/N far-ultraviolet spectra of O giants and
    line_2:        supergiants in the Milky Way and the Large and Small Magellanic
    line_3:        Clouds. We will derive the properties of the star/wind systems
    line_4:        from the photospheric and wind spectra, and we will investigate
    line_5:        the effect of chemical composition on the properties of the
    line_7:        wind.

!
! end of abstract

general_form_proposers:

  lname:           HEAP
    fname:         SARA
    mi:            R.
    inst:          NASA, GODDARD SPACE FLIGHT CENTER
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        2
    section:       1
    line_1:        Recent observations (e.g. Hutchings 1982, Ap.J. 38, 309)
    line_2:        have shown that O stars in the Magellanic clouds have winds with
    line_3:        lower terminal velocities than do O stars of the same spectral
    line_4:        type in the Milky Way. Models of radiatively driven winds
    line_5:        (e.g. Kudtitzki, Pauldrach, Puls, 1987) are now able to
    line_6:        explain this effect. Chemical abundance is the key factor:
    line_7:        it plays a role in determining the structure and intensity of the
    line_8:        wind. Hence, stars in the Magellanic Clouds should have smaller
    line_9:        mass-loss rates and terminal velocities than their spectral
    line_10:       counterparts in the Milky Way, due to their lower metallicities.
    line_11:       In this program, we will investigate the effects of chemical
    line_12:       composition in greater detail. From ground-based and HRS
    line_13:       spectra, we will estimate the basic parameters of each star:
    line_14:       temperature, gravity, and chemical composition of the atmosphere.
    line_15:       From HRS spectra, we will also estimate the intensity, kinematic
    line_16:       and ioniztion structure, and terminal velocity of the wind. We
    line_17:       will then seek to explain these data in terms of radiatively
    line_18:       driven winds.

!

  question:        3
    section:       1
    line_1:        Cycle 0: PC images of the 30 Doradus field. Line 13.5.
    line_2:        Cycles 1 & 2: the remainder of the targets.

!

  question:        4
    section:       1
    line_1:        The ST/HRS is necessary to obtain a high-dispersion ultraviolet spectrum at
    line_2:        high S/N.

!

  question:        5
    section:       1
    line_1:        No special requirements.

!

  question:        6
    section:       1
    line_1:        none

!

  question:        7
    section:       1
    line_1:        We will need to make astrometric reductions of the WFPC images
    line_2:        to ensure the proper target acquisition by the HRS. At the HRS
    line_3:        Data Analysis Facility, we will integrate the spectral segments
    line_4:        obtained at different grating settings to form a single, high-
    line_5:        quality spectrum of each star in the program. We will publish
    line_6:        the set of spectra as an atlas, with appropriate commentary.

!

  question:        8
    section:       1
    line_1:        High dispersion ground-based spectra will also be needed to help
    line_2:        determine basic stellar parameters. However, these observations
    line_3:        will be obtained well in advance of the HRS observations.

!

  question:        13
    section:       1
    line_1:        The HRS team will construct an ultraviolet spectral atlas
    line_2:        (1100-1750 A) of O stars in the Milky Way and Magellanic
    line_3:        Clouds.

!
!end of general form text

general_form_address:

  lname:           HEAP
    fname:         SARA
    mi:            R.
    category:      PI
    inst:          GODDARD SPACE FLIGHT CENTER
    addr_1:        CODE 681
    city:          GREENBELT
    state:         MD
    zip:           20771
    country:       USA

!
! end of general_form_address records

fixed_targets:

    targnum:       2
    name_1:        MK42
    descr_1:       STAR; O3 I/WN6-A
    descr_2:       IN 30 DORADUS (LMC)
    pos_1:         RA=05H38M42.10S+/-0.5",
    pos_2:         DEC=-69D05'54.76"+/-0.5"
    equinox:       2000
    pm_or_par:     NO
    acqpr_1:       COMP
    fluxnum_1:     1
    fluxval_1:     V=12.67+/-0.1, E(B-V)=0.30

!

    targnum:       8
    name_1:        30DOR-STARS
    descr_1:       STAR; O STARS NEAR R136A
    descr_2:       IN 30 DORADUS (LMC)
    pos_1:         R = 12.5",
    pos_2:         PA = 0D,
    pos_3:         FROM 2
    equinox:       1950
    pm_or_par:     NO
    fluxnum_1:     1
    fluxval_1:     V=10.2+/-0.1

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       13.500
    targname:      30DOR-STARS
    config:        PC
    opmode:        IMAGE
    aperture:      ALL
    sp_element:    F284W
    num_exp:       5
    time_per_exp:  450S
    priority:      1
    param_1:       PRE-FLASH=YES
    req_1:         DO FOR TARG 8;
    req_3:         UNPROTECTED;
    req_4:         CYCLE 0
    comment_1:     ALL 30 DOR O-STARS (TARGETS 1-3) ARE
    comment_2:     IN THIS FIELD OF VIEW. STELLAR AND
    comment_3:     SCATTERING CONTINUM FILTER. REVISED
    comment_4:     IN LIGHT OF POST-LAUNCH CAPABILITIES
    comment_5:     FOR CYCLE 0. EARLY ACQ FOR 100-250

!
! end of exposure logsheet

! No scan data records found