! File: 4892C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:08:23:49 coverpage: title_1: DUPLICITY AMONG HYADES STARS title_2: CYCLE 3, HIGH sci_cat: STELLAR ASTROPHYSICS sci_subcat: ASTROMETRY proposal_for: GTO/AST cont_id: 1004 pi_fname: WILLIAM pi_mi: H. pi_lname: JEFFERYS pi_inst: TEXAS, UNIVERSITY OF pi_country: USA pi_phone: 512-471-4461 keywords_1: DUPLICITY; BINARIES; MULTIPLE STARS; HYADES hours_pri: 40.25 num_pri: 41 pi_position: PROFESSOR OF ASTRONO ! end of coverpage abstract: line_1: We propose to use FGS in the TRANS mode to examine, at high angular line_2: resolution, a representative sample of probable Hyades cluster members in an line_3: effort to establish the incidence of duplicity among Hyades stars. The line_4: frequency of multiple stars in stellar systems and populations represents a line_5: significant aspect of star formation and stellar evolution. line_7: Among Hyades stars brighter than V ~ 12.0, companions should be observable to line_8: Delta m ~ 2. Binaries of small Delta m should be readily detectable at V ~ 15. ! ! end of abstract general_form_proposers: lname: JEFFERYS fname: WILLIAM mi: H. inst: TEXAS, UNIVERSITY OF country: USA ! lname: BENEDICT fname: GEORGE mi: F. inst: TEXAS, UNIVERSITY OF country: USA ! lname: DUNCOMBE fname: RAYNOR mi: L. inst: TEXAS, UNIVERSITY OF country: USA ! lname: FRANZ fname: OTTO mi: G. inst: LOWELL OBSERVATORY country: USA ! lname: FREDRICK fname: LAURENCE mi: W. inst: VIRGINIA, UNIVERSITY OF country: USA ! lname: HEMENWAY fname: PAUL mi: D. inst: TEXAS, UNIVERSITY OF country: USA ! lname: SHELUS fname: PETER mi: J. inst: TEXAS, UNIVERSITY OF country: USA ! lname: VAN ALTENA fname: WILLIAM mi: F. inst: YALE UNIVERSITY country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: Line 1, page 11 defines, for each target, an observation consisting of line_2: a set of continuous scans at a scan rate of 0.04 arcsec per sec and a scan line_3: length of 1.2 arcsec per interferometer axis. There are 30 scans/observation line_4: (total exposure time 900 seconds), sufficient to permit detection of close line_5: companions to a Delta-m ~ 2 mag for stars of V