Low-Mass Binaries in the Hyades

Details Low-Mass Binaries in the Hyades Low-Mass Binaries in the Hyades

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1248g&link_type=abstract

Astronomical Journal v.110, p.1248

Astronomy and Astrophysics

Astronomy

14

Open Clusters And Associations: Individual: Hyades, Binaries: Close

Scientific paper

We have used the HST Planetary Camera to search for companions to a sample of low-mass (Mυ > 11.5) members of the Hyades cluster. Our observations, which extend in sensitivity beyond the hydrogen-burning limit, detect 5 companions amongst the 21 targets. One binary system appears to lie 70% beyond the Hyades, so the observed binary fraction is 20%±10%. If the distribution of orbital parameters is similar to that of higher mass stars, this implies an overall binary fraction of 27%±16%. Our result for the Hyades is in good agreement with analysis of the 5.3 pc nearby star sample, but is significantly lower than the binary fractions observed amongst ˜1 Msunmain-sequence stars (˜60%) and T Tauri stars (>70%).

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