!  File:  1094C.PROP
!  Database:  PEPDB
!  Date:  16-FEB-1994:01:26:34

coverpage:

  title_1:         SEARCH FOR OPTICAL VARIABILITY ASSOCIATED WITH BLACK HOLES
    sci_cat:       STELLAR ASTROPHYSICS
    proposal_for:  GTO/HSP
    pi_fname:      ROBERT
    pi_mi:         C.
    pi_lname:      BLESS
    pi_inst:       WISCONSIN, UNIVERSITY OF
    pi_country:    USA
    pi_phone:      (608) 262-1715
    keywords_1:    VARIABLE, INTERACTING BINARIES, BLACK HOLES
    hours_pri:     6.00
    num_pri:       4
! end of coverpage

abstract:

    line_1:        It has been suggested that luminous matter passing through an accretion disk
    line_2:        towards the event horizon of a black hole is likely to emit a short series of
    line_3:        pulses at an increasing frequency. These so-called dying pulses trains would
    line_4:        have a period of the order of milliseconds for stellar mass black holes. A
    line_5:        search for such pulse trains will be made among candidate objects.
    line_6:        Revision History: Received on RPS 9/1/89;  Added to SCCS 9/5/89
    line_7:        RPSS V7.2 remote & local; Added data-fmt - SALM 9/7/89;   Removed
    line_8:        target NGC7078; Added target A0620-00 & related changes; Changed "contiguous
    line_9:        exposures" to "NON-INT" - Dolan 9/26/89;  Changed fluxval, ONBRD ACQ,
    line_10:       and SAMPLE_TIME - SALM 2/14/90;  Added acq to repeat sequence - SALM 6/25/90;
    line_11:       revised time_per_exp line 0.500--BJW 7/11/90; Changed cycle 1 to cycle 2--
    line_12:       BJW 2/26/91; Split up proposal by cycle--BJW 3/22/91; Update target
    line_13:       positions--BJW 7/5/91; Changed timing of observations of Cyg X-1 --BJW
    line_14:       9/20/91;

!
! end of abstract

general_form_proposers:

  lname:           VAN CITTERS
    fname:         G.
    mi:            W.
    inst:          NATIONAL SCIENCE FOUNDATION
    country:       USA

!

  lname:           BLESS
    fname:         ROBERT
    mi:            C.
    inst:          WISCONSIN, UNIVERSITY OF
    country:       USA

!

  lname:           DOLAN
    fname:         JOSEPH
    mi:            F.
    inst:          NASA, GODDARD SPACE FLIGHT CENTER
    country:       USA

!

  lname:           ELLIOT
    fname:         JAMES
    mi:            L.
    inst:          MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    country:       USA

!

  lname:           ROBINSON
    fname:         EDWARD
    mi:            L.
    inst:          TEXAS, UNIVERSITY OF
    country:       USA

!

  lname:           WHITE
    fname:         RICHARD
    mi:            L.
    inst:          SPACE TELESCOPE SCIENCE INSTITUTE
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        Each object would be monitored for 30 minutes to an hour using about 100
    line_2:        microsec integration times with a broad filter. Each target should be observed
    line_3:        more than once (during different x-ray intensity states, for example).
    line_4:        Observations of the center of an x-ray emitting globular cluster would require
    line_5:        0.4 arc sec aperture and a narrower filter to reduce background light.
    line_7:        Cycle 0: Cyg X-1; cycle 1: remainder

!

  question:        4
    section:       1
    line_1:        ST is required in order to eliminate atmospheric noise, to observe in the UV
    line_2:        where burst amplitudes are expected to be larger than in the visual, and to be
    line_3:        able to use small apertures.

!

  question:        13
    section:       1
    line_1:        A search is to be made in black hole candidate objects for "dying pulse trains"
    line_2:        indicative of matter spiraling towards the event horizon of a black hole.

!
!end of general form text

general_form_address:

  lname:           BLESS
    fname:         ROBERT
    mi:            C.
    category:      PI
    inst:          UNIVERSITY OF WISCONSIN
    addr_1:        SPACE ASTRONOMY LAB.
    addr_2:        1150 UNIVERSITY AVE.
    city:          MADISON
    state:         WI
    zip:           53706
    country:       USA
    phone:         (608) 262-1715

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        CYG-XR-1
    descr_1:       X-RAY BINARY
    descr_2:       SAO69181
    pos_1:         RA = 19H 58M 21.521S +/- 0.1S,
    pos_2:         DEC = +35D 12' 5.088" +/- 0.5"
    equinox:       2000
    comment_1:     POSREF = SAO, WITH PM.
    fluxnum_1:     1
    fluxval_1:     V = 8.6

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       0.500
    targname:      CYG-XR-1
    config:        HSP/UV2
    opmode:        ACQ
    num_exp:       1
    time_per_exp:  40S
    fluxnum_1:     1
    priority:      1
    param_1:       DATA-FORMAT=WORD,
    req_1:         CYCLE 1 / 0.5-1.0;
    req_2:         ONBOARD ACQ FOR 1;

!

    linenum:       1.000
    targname:      CYG-XR-1
    config:        HSP/UV2
    opmode:        SINGLE
    aperture:      1.0
    sp_element:    F140LP
    num_exp:       3
    time_per_exp:  20M
    fluxnum_1:     1
    priority:      1
    param_1:       SAMPLE-TIME=0.0001,
    req_1:         REPEAT 0.5-1 EVERY 30D +/- 7D
    req_2:         FOR 2 MORE TIMES;
    req_3:         NON-INT;
    req_4:         RT ANALYSIS
    comment_1:     PREFER TDRSS DOWNLINK RATHER
    comment_2:     THAN TAPE RECORDER.

!
! end of exposure logsheet

! No scan data records found