!   $Id: 5297,v 15.1 1994/07/27 16:18:20 pepsa Exp $

coverpage:

  title_1:         FIRST SPECTRA OF O STARS IN R136A
    sci_cat:       STELLAR ASTROPHYSICS
    proposal_for:  SMC/ERO
    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:    HOT STARS, MASSIVE STARS, CLUSTERS
    hours_pri:     6.28
    num_pri:       2
    hrs:           Y
! end of coverpage

abstract:

    line_1:        Hubble images of the cluster, R136a, in the LMC
    line_2:        indicate that the cluster contains 3 Wolf-Rayet stars,
    line_3:        R136a1,-a2, and a3  (Campbell et al. 1992) and 
    line_4:        numerous O and B-type stars. Although models for WR stars
    line_5:        are not well enough developed to infer the basic parameters
    line_6:        of the 3 WR stars in R136a, models for O stars are well
    line_7:        well established, and they suggest that the O stars
    line_8:        in R136a are relatively normal, having initial masses no
    line_9:        higher than 60 Msun (Heap et al. 1992, Malumuth & Heap 1992,
    line_10:       di Marchi et al. 1993); there are no unusual "super-massive" 
    line_11:       stars in R136a. With HST/GHRS/CoSTAR, it will be possible
    line_12:       to obtain spectra of an O star in R136a  without contam-
    line_13:       ination by WR stars. These spectra will be able to confirm 
    line_14:       or invalidate the photometric results. Thus, these spectra
    line_15:       will have implications both for the population of R136a
    line_16:       and for the validity of stellar population studies of 
    line_17:       giant extragalactic HII regions and starbursts that are
    line_18:       based entirely on photometry.        

!
! end of abstract

general_form_proposers:

!

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

  lname:           GHRS-TEAM
    fname:         WHAT_A_GREAT
    inst:          NASA, GODDARD SPACE FLIGHT CENTER
    country:       USA


!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        This program is similar to the first ERO program
    line_2:   on Melnick 42: the target is similar (a hot, massive star 
    line_3:   in 30 Dor), it uses the same instrument (GHRS/Side1/G140L). 
    line_4:   In this case, there are two targets, R136a2 (presumably 
    line_5:   WN4.5) and R136a5 (presumably early O star). R136a5 is about
    line_6:   1 mag fainter than Mk 42, but the efficiency of the GHRS
    line_7:   should be twice as high as before COSTAR, so this program 
    line_8:   uses the same exposure time on R136a5 as it did on Mk 42. 
    line_9:   The exposure times are 4 times shorter on R136a2, since we 
    line_10:  only need to confirm the spectral type and basic spectral
    line_11:  features. This program will also yield excellent pictures
    line_12:  of the R136a field in both N1 and N2, thus confirming the
    line_13:  benefits of COSTAR for imaging.
    line_14:        The observing strategy is the following. We first aquire
    line_15:  a spot between R136a1 and R136a2. If the two stars are of
    line_16:  equal brightness, then the spot will be half-way between
    line_17:  and a distance of 0.053" from R136a1. We next slew to R136a2
    line_18:  and get a spectrum. By assuming the spot is really R136a1,
    line_19:  we may have overshot R136a2 by 0.053, but that's okay.
    line_20:  We next slew to R136a5 & get a spectrum. Again we may over
    line_21:  shoot a little. Finally we get some UV maps.

  question:        4
    section:       1
    line_1:        The HST+CoSTAR/GHRS is needed to isolate individual stars
    line_2:        in the very compact cluster, R136a. In this program, a
    line_3:        spectrum of R136a5 will be obtained even though there is
    line_4:        a brighter star, R136a2, less than 0.3" away!

  question:        5
    section:       1

  question:        6
    section:       1
    line_1:        This program will undoubtedly be one of the first external
    line_2:        observations with the GHRS using Side 1 since the summer of
    line_3:        1991. 

!
  question:        7
    section:       1
    line_1:        The spectra will be reduced and analyzed at Goddard Space
    line_2:        Flight Center. Modeling of the wind and estimation of the
    line_3:        basic stellar parameters will be in collaboration with HST
    line_4:        GTO's and GO's. 
 
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
    phone:         301-286-9545

! end of general_form_address records

fixed_targets:


    targnum:       1
    name_1:        R136a1
    descr_1:       B,103,D,203
    pos_1:         RA = 05H 38M 42.438S +/- 0.1S,
    pos_2:         DEC = -69D 06' 02.294" +/- 0.5"
    equinox:       2000
    pm_or_par:     NO
    fluxnum_1:     1
    fluxval_1:     V=12.77
    fluxnum_2:     2
    fluxval_2:     B-V=+0.43
    comment_1:     V,B-V from Malumuth & Heap (1993)

    targnum:       2
    name_1:        R136a2
    descr_1:       B,103,D,203
    pos_1:         RA = 05H 38M 42.4576S +/- 0.1S,
    pos_2:         DEC = -69D 06' 02.242" +/- 0.5"
    equinox:       2000
    pm_or_par:     NO
    fluxnum_1:     1
    fluxval_1:     V=13.38
    fluxnum_2:     2
    fluxval_2:     B-V=+0.43
    comment_1:     WN star in R136a; coordinates and
    comment_2:     V,B-V from Malumuth & Heap (1993)

    targnum:       5
    name_1:        R136a5
    descr_1:       B,105,D,203
    pos_1:         RA = 05H 38M 42.4785S +/- 0.1S,
    pos_2:         DEC = -69D 06' 02.096" +/- 0.5"
    equinox:       2000
    pm_or_par:     NO
    fluxnum_1:     1
    fluxval_1:     V=13.73
    fluxnum_2:     2
    fluxval_2:     B-V=+0.12 
    comment_1:     O star in R136a; coordinates and
    comment_2:     V,B-V from Malumuth & Heap (1993)

! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1
    targname:      R136a1
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  25S
    fluxnum_1:     1
    priority:      1
    param_1:       SEARCH-SIZE=5
    req_1:         CYCLE 4/1-101;
    req_2:         ONBOARD ACQ FOR 2-3;
    req_3:         SEQ 1-101 NO GAP
    comment_1:     Time=(128*Nmap +SS2)*StepT
    comment_2:         =(0 +5x5)*1.0S = 25S
    comment_3:     GHRS HDBK/Fig 7.3 gives N1 c/s=2500
    comment_4:      for V=13.0, (B-V)o=-.3, E(B-V)=.4
    comment_5:     BRIGHT=RETURN assumed

    linenum:       2
    targname:      R136a1
    config:        HRS
    opmode:        ACQ/PEAKUP
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  102S
    fluxnum_1:     1
    priority:      1
    req_1:         CYCLE 4;
    comment_1:     Time=Fapt*StepT
    comment_2:         =102 * 1S 

    linenum:       3
    targname:      R136a1
    config:        HRS
    opmode:        ACQ/PEAKUP
    aperture:      0.25 
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  25S
    fluxnum_1:     1
    priority:      1
    param_1:       SEARCH-SIZE=5
    req_1:         ONBOARD ACQ FOR 4-52 
    comment_1:     Time=SSIZE^2 * StepT
    comment_2:         =25 * 1S 
    comment_3:     BRIGHT=RETURN assumed

    linenum:       4
    targname:      R136a1
    config:        HRS
    opmode:        IMAGE
    aperture:      0.25
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  169S
    fluxnum_1:     1
    priority:      1
    param_1:       NX=13,
    param_2:       NY=13,
    param_3:       DELTA-X=1,
    param_4:       DELTA-Y=1
    comment_1:     Time=13*13*1S=169S

    linenum:       5
    targname:      R136a2
    config:        HRS
    opmode:        IMAGE
    aperture:      0.25
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  169S
    fluxnum_1:     1
    priority:      1
    param_1:       NX=13,
    param_2:       NY=13,
    param_3:       DELTA-X=1,
    param_4:       DELTA-Y=1
    comment_1:     Time=13*13*1S=169S

! END TARGET ACQUISITION

! BLIND SLEW TO R136A2 & SPECTRUM

    linenum:       20
    targname:      R136a2
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G140L
    wavelength:    1300 
    num_exp:       1
    time_per_exp:  10M
    priority:      1
    param_1:       STEP-PATT=3,
    param_2:       FP-SPLIT=NO

    linenum:       21
    targname:      R136a2
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G140L
    wavelength:    1610 
    num_exp:       4
    time_per_exp:  10M
    priority:      1
    param_1:       STEP-PATT=3,
    param_2:       FP-SPLIT=NO 

! BLIND SLEW TO R136A5 & SPECTRUM

!
    linenum:       50 
    targname:      R136a5
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G140L
    wavelength:    1610
    num_exp:       4
    time_per_exp:  30M
    priority:      1
    param_1:       STEP-PATT=3,
    param_2:       FP-SPLIT=FOUR 
    comment_1:     total texp=120M

    linenum:       51
    targname:      R136a5
    config:        HRS
    opmode:        ACCUM
    aperture:      0.25
    sp_element:    G140L
    wavelength:    1300 
    num_exp:       1
    time_per_exp:  30M
    priority:      1
    param_1:       STEP-PATT=3,
    param_2:       FP-SPLIT=FOUR
    comment_1:     total texp=30M 

    linenum:       52
    targname:      WAVE
    config:        HRS
    opmode:        ACCUM
    aperture:      SC2
    sp_element:    G140L
    wavelength:    1300 
    num_exp:       1
    time_per_exp:  25.6S
    priority:      1
    param_1:       STEP-PATT=3,
    param_2:       FP-SPLIT=NO 
    comment_1:     WAVECAL FOR SPECTRA
 
! UV MAP OF REGION

    linenum:       99
    targname:      R136a5
    config:        HRS
    opmode:        IMAGE
    aperture:      0.25
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  169S
    fluxnum_1:     1
    priority:      1
    param_1:       NX=13,
    param_2:       NY=13,
    param_3:       DELTA-X=1,
    param_4:       DELTA-Y=1
    comment_1:     Time=13*13*1S=169S

    linenum:       100
    targname:      R136a5
    config:        HRS
    opmode:        IMAGE
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  968S
    fluxnum_1:     1
    priority:      1
    param_1:       NX=22,
    param_2:       NY=22,
    param_3:       DELTA-X=2,
    param_4:       DELTA-Y=2
    comment_1:     Time=22*22*2S=968S

    linenum:       101
    targname:      R136a5
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  1161S
    fluxnum_1:     1
    priority:      1
    param_1:       SEARCH-SIZE=3,
    param_2:       LOCATE=NO,MAP=ALL-POINTS
    comment_1:     Time=(128*Nmap +SS2)*StepT
    comment_2:         =(128*9 +3X3)*1.0S=1161S


! end of exposure logsheet

! No scan data records found