!  File:  2459C.PROP
!  Database:  PEPDB
!  Date:  17-FEB-1994:06:52:39

coverpage:

  title_1:         THE CENTRAL STAR CLUSTER OF THE GALAXY
    sci_cat:       STELLAR POPULATIONS
    sci_subcat:    GALACTIC CENTER
    proposal_for:  GO
    pi_title:      DR.
    pi_fname:      KWOK
    pi_mi:         Y.
    pi_lname:      LO
    pi_inst:       ILLINOIS, UNIVERSITY OF
    pi_country:    USA
    pi_phone:      217-333-9381
    keywords_1:    GALACTIC NUCLEUS, CENTRAL STAR CLUSTER, ACTIVE
    keywords_2:    GALACTIC NUCLEI
    hours_pri:     0.70
    num_pri:       1
    wf_pc:         X
    funds_amount:  34060
    funds_length:  12
    funds_date:    MAY-91
    pi_position:   PROFESSOR
! end of coverpage

abstract:

    line_1:        We propose to use the Planetary Camera on the HST to image the Galactic center
    line_2:        at 0.1" (850 AU at 8.5 kpc) at 10326 and 8750 A. Recent observations have
    line_3:        revealed a multitude of unusual phenomena at the center, suggesting that the
    line_4:        Galactic center may be a low energy verion of an active galactic nucleus and
    line_5:        may harbor a massive collapsed object.  Unambiguous delineation of the central
    line_6:        star cluster, which would provide an important constraint on the central mass
    line_7:        distribution has been hampered by the inadequate angular resolution of
    line_8:        ground-based observations. The HST observations will map directly the
    line_9:        structure of the near-IR source, IRS16, which has been the focus of previous
    line_10:       ground-based observations to define the central star cluster.  The resolution
    line_11:       and sensitivity of the proposed observations can also detect and resolve the
    line_12:       individual K and M giant stars of the central star cluster, despite the large
    line_13:       extinction to the center.  Understanding the nearest galactic nucleus will be
    line_14:       important for the interpretation of the more energetic active galactic nuclei.

!
! end of abstract

general_form_proposers:

  lname:           LO
    fname:         KWOK
    title:         P.I.
    mi:            Y.
    inst:          ILLINOIS, UNIVERSITY OF
    country:       USA

!

  lname:           BIRETTA
    fname:         JOHN
    title:         DR.
    inst:          NRAO
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        5
    section:       0
    line_1:

!
!end of general form text

general_form_address:

  lname:           LO
    fname:         KWOK
    mi:            Y.
    title:         DR.
    category:      PI
    inst:          UNIVERSITY OF ILLINOIS
    addr_1:        123 ASTRONOMY BUILDING
    addr_2:        1002 WEST GREEN STREET
    city:          URBANA
    state:         IL
    zip:           61801
    country:       USA

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        GALACTIC-CENTER
    name_2:        IRS16
    descr_1:       GALAXY; STELLAR CLUSTER; AGN;
    descr_2:       NUCLEUS; GALACTIC NIR OBJECT
    pos_1:         RA = 17H 42M 28.88S +/- 0.07S,
    pos_2:         DEC =-28D 59' 24.8" +/- 1.0"
    equinox:       1950
    comment_1:     PROGRAM OBJECT AT RA = 17H 42M
    comment_2:     29.33S DEC = -28D 59' 18.6" (1950)
    comment_3:     TARGET POSITION PLACES BRIGHT
    comment_4:     STARS OFF DETECTOR
    fluxnum_1:     1
    fluxval_1:     I = 22.5 +/- 0.5
    fluxnum_2:     2
    fluxval_2:     TYPE = K0 III
    fluxnum_3:     3
    fluxval_3:     A(V) =30
    fluxnum_4:     4
    fluxval_4:     F(9800) = 8 +/-4 E-21
    fluxnum_5:     5
    fluxval_5:     SIZE = 0.3  +/- 0.3

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      GALACTIC-CENTER
    config:        PC
    opmode:        IMAGE
    aperture:      P6
    sp_element:    F1042M
    num_exp:       1
    time_per_exp:  23M
    s_to_n:        28
    fluxnum_1:     1
    fluxnum_2:     2
    fluxnum_3:     3
    priority:      1
    param_1:       PRE-FLASH=YES,
    param_2:       CR-SPLIT=DEF,
    param_3:       CLOCKS=NO
    req_1:         SEQ 1-2 NO GAP;
    req_2:         ORIENT 90D +/- 6D;
    req_3:         GUID TOL 0.030";
    req_4:         CYCLE 1

!

    linenum:       2.000
    targname:      GALACTIC-CENTER
    config:        PC
    opmode:        IMAGE
    aperture:      P6
    sp_element:    F875M
    num_exp:       1
    time_per_exp:  23M
    s_to_n:        5
    fluxnum_1:     1
    fluxnum_2:     2
    fluxnum_3:     3
    priority:      2
    param_1:       PRE-FLASH=YES,
    param_2:       CR-SPLIT=DEF,
    param_3:       CLOCKS=NO
    req_1:         ORIENT 90D +/- 6D;
    req_2:         GUID TOL 0.030";
    req_3:         CYCLE 1

!
! end of exposure logsheet

! No scan data records found