Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6881f&link_type=abstract
HST Proposal ID #6881
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6881
Scientific paper
A search with Hubble Space Telescope Fine Guidance Sensor 3 in TRANS mode of 36 probable Hyades cluster members in the magnitude range V=10--15 has yielded nine certain binary detections. Subsequent observations have shown that among these, VA351 has a period of approximately 5 years. We propose to carry out astrometry of this faint Hyades binary with FGS in a combination of POS and TRANS modes. Such new observations, combined with FGS astrometry already in hand, and with orbital radial velocity measures, will yield masses and absolute magnitudes of this low- luminosity Hyades members independent of the kinematic mean cluster distance and with an accuracy of 5 percent or better. VV Cep is a eclipsing spectroscopic binary consisting of a very massive supergiant and a hot main sequence companion. At the time requested in this proposal, the hot companion will be eclipsed by the supergiant, thus affording the opportunity to study at high angular resolution the supergiant star and its extended envelope.
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