!  File:  5064C.PROP
!  Database:  PEPDB
!  Date:  23-FEB-1994:18:37:26

coverpage:

  title_1:         DIAGNOSTIC OF EARLY STELLAR EVOLUTION: SEARCH FOR PRE-MAIN
    title_2:       SEQUENCE STARS AND DETERMINATION OF THEIR ABSOLUTE ORBITS-FIXED
    sci_cat:       STELLAR POPULATION
    sci_subcat:    ASTROMETRY
    proposal_for:  GO/DD
    longterm:      5
    cont_id:       3688
    pi_title:      PROF.
    pi_fname:      PIERLUIGI
    pi_mi:         L.
    pi_lname:      BERNACCA
    pi_inst:       DEPARTMENT OF ASTRONOMY OF THE UNIVERSITY OF PADOVA
    pi_country:    ITALY
    pi_phone:      39-424-462665
    hours_pri:     4.97
    num_pri:       11
    fgs:           Y
    pi_position:   ASSOCIATE PROFESSOR
    off_fname:     PIERLUIGI
    off_mi:        L.
    off_lname:     BERNACCA
    off_title:     PROF
    off_inst:      DEPARTMENT OF ASTRONOMY OF THE UNIVERSITY OF PADOVA
    off_addr_1:    OSSERVATORIO ASTROFISICO
    off_city:      ASIAGO-VI
    off_zip:       36012
    off_country:   ITALY
    off_phone:     39-424-462665
    off_telex:     430111 SETOUR,I
! end of coverpage

abstract:

    line_1:        Searching for binary and multiple stars among pre-main-sequence objects and
    line_2:        determining their orbits and masses are necessary for a breakthrough in our
    line_3:        knowledge of the star formation process.  First priority targets may be
    line_4:        advantageously selected from the observing program of the ESA HIPPARCOS
    line_5:        satellite.  HIPPARCOS will provide high precision individual parallaxes to
    line_6:        distances of 150 pc and significantly improved group parallaxes to 500 pc.
    line_7:        Added on targets will be the few binaries detected by lunar occultations, in
    line_8:        the separation range 10 to 570 milliarcseconds (mas).  We are proposing to
    line_9:        perform astrometric measurements of 5 T Tauri stars and 5 Ae/Be Herbig
    line_10:       objects, by means of the HST Fine Guidance Sensor (FGS) in the TRANS mode.  The
    line_11:       FGS will unveil their possible duplicity in the range 0".1 down to 10 mas.  From
    line_12:       FGS measured orbits, period and eccentricity distributions will be derived, and
    line_13:       via accurate parallaxes the sum of the masses can be directly determined.  The
    line_14:       HST FGS is unique for carrying out the proposed research insofar lunar
    line_15:       occultations are not generally available and provide angular separation in the
    line_16:       occultation direction only; speckle interferometry is severely limited in
    line_17:       angular resolution for large magnitude differences between the binary
    line_18:       components. These observations will also serve as critical test cases for
    line_19:       the HIPPARCOS double stars reductions. This is a Long-Term proposal.
    line_20:       DELETED LINES 1,3,4,6-11 FROM 3688 TO CREATE THIS PROPOSAL

!
! end of abstract

general_form_proposers:

  lname:           BARBARO
    fname:         GUIDO
    title:         PROF.
    mi:            A.
    inst:          DIPARTIMENTO DI ASTRONOMIA DELL'UNIVERSITA' DI PADOVA
    country:       ITALY
    esa:           Y

!

  lname:           BASTIAN
    fname:         ULRICH
    title:         DR.
    inst:          ASTRONOMISCHEN RECHEN-INSTITUT
    country:       GERMANY
    esa:           Y

!

  lname:           BUCCIARELLI
    fname:         BEATRICE
    title:         DR.
    inst:          SPACE TELESCOPE SCIENCE INSTITUTE
    country:       USA
    esa:           Y

!

  lname:           LATTANZI
    fname:         MARIO
    title:         DR.
    mi:            G.
    inst:          SPACE TELESCOPE SCIENCE INSTITUTE
    country:       USA
    esa:           Y

!

  lname:           PANNUNZIO
    fname:         RENATO
    title:         DR.
    inst:          OSSERVATORIO ASTRONOMICO DI TORINO
    country:       ITALY
    esa:           Y

!

  lname:           BADIALI
    fname:         MASSIMO
    title:         DR.
    inst:          ISTITUTO DI ASTROFISICA SPAZIALE DEL CNR, FRASCATI
    country:       ITALY
    esa:           Y

!

  lname:           MAMMANO
    fname:         AUGUSTO
    title:         PROF.
    inst:          UNIVERSITA' DI MESSINA
    country:       ITALY
    esa:           Y

!
! end of general_form_proposers block

! No records found

general_form_address:

  lname:           BERNACCA
    fname:         PIERLUIGI
    mi:            L.
    title:         PROF.
    category:      PI
    inst:          ASTRONOMY DEPARTMENT OF THE UNIVERSITY OF PADOVA
    addr_1:        OSSERVATORIO ASTROFISICO
    city:          ASIAGO-VI
    zip:           36012
    country:       ITALY
    phone:         39-424-462665
    telex:         430111 SETOUR,I

!
! end of general_form_address records

fixed_targets:

    targnum:       2
    name_1:        20160
    name_2:        HD281934
    name_3:        BP-TAU
    descr_1:       A,156
    pos_1:         RA= 04H 19M 15.829S +/- 0.07S,
    pos_2:         DEC= +29D 6' 27.25" +/- 1"
    equinox:       2000
    pos_epoch_bj:  J
    pos_epoch_yr:  1987.00
    fluxnum_1:     1
    fluxval_1:     V= 10.9 +/- 0.5
    fluxnum_2:     2
    fluxval_2:     B-V= 1.3 +/- 0.5

!

    targnum:       5
    name_1:        53444
    name_2:        HD94878
    name_3:        GG-CAR
    descr_1:       A,116
    pos_1:         RA= 10H 55M 58.951S +/- 0.07S,
    pos_2:         DEC= -60D 23' 33.62" +/- 1"
    equinox:       2000
    pm_or_par:     Y
    pos_epoch_bj:  J
    pos_epoch_yr:  2000.00
    ra_pm_val:     -0.000533
    fluxnum_1:     1
    fluxval_1:     V= 9.46 +/- 0.24
    fluxnum_2:     2
    fluxval_2:     B-V= -0.16 +/- 0.33

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       2.000
    targname:      20160
    config:        FGS
    opmode:        TRANS
    aperture:      3
    sp_element:    F550W
    num_exp:       1
    time_per_exp:  8.33M
    param_1:       SCANS=9
    param_2:       STEP-SIZE=0.6
    req_1:         CYCLE 2
    comment_1:     IF ST SCI MUST MOVE THE TARGET MORE
    comment_2:     THAN 5 ARCSECS FROM THE DEFAULT OF
    comment_3:     POSTARG =(0,0), PLEASE NOTIFY CONTACT

!

    linenum:       5.000
    targname:      53444
    config:        FGS
    opmode:        TRANS
    aperture:      3
    sp_element:    F550W
    num_exp:       1
    time_per_exp:  14.38M
    param_1:       SCANS=9
    param_2:       STEP-SIZE=0.6
    req_1:         CYCLE 2
    comment_1:     IF ST SCI MUST MOVE THE TARGET MORE
    comment_2:     THAN 5 ARCSECS FROM THE DEFAULT OF
    comment_3:     POSTARG =(0,0), PLEASE NOTIFY CONTACT

!
! end of exposure logsheet

! No scan data records found