Low-mass binaries in the Hyades - completing the survey

Details Low-mass binaries in the Hyades - completing the survey Low-mass binaries in the Hyades - completing the survey

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6344r&link_type=abstract

HST Proposal ID #6344

Statistics

Hst Proposal Id #6344 Cs

Scientific paper

We propose to complete our Planetary Camera observations of the known late-type {M_V > 12} members of the Hyades cluster. Our aim is to use the unparalleled spatial resolution of HST to determine the fraction of binary/multiple systems in this complete, proper-motion selected sample. By concentrating on the low-luminosity stars, these observations offer the prospect of detecting cool, sub-stellar mass brown dwarfs - at the age of the Hyades, a 0.06 M_odot BD has M_I 15.5. During cycle 4, we obtained observations of 23 stars, four of which proved to be Hyades binary. Allowing for observational selection effects, this implies a binary fraction of 26 +/- 15 % - comparable to the 32 % observed in the field. Moreover, all of the binaries are near equal-mass systems, with none of the companions close to the H-burning limit. Both of these results disagree with the predictions of the models by Kroupa {1995, MN, in press}, which predict a larger binary fraction and more very low-mass companions. Clearly, however, the observational results are based on small-number statistics. The current proposal aims at redressing this defect by completing observations of this well-defined sample, more than doubling the number of Hyades stars surveyed. These observations will be complemented by a ground-based radial velocity survey.

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