An Adaptive Optics Search for Visual Binaries in M 34

Details An Adaptive Optics Search for Visual Binaries in M 34 An Adaptive Optics Search for Visual Binaries in M 34

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..998s&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Physics

Optics

M 34, Adaptive Optics, Binary Stars, Clusters

Scientific paper

We have used the PUEO adaptive optics camera on the Canada--France--Hawaii Telescope (CFHT) to carry out a search for visual binaries among the late-type members of the M 34 cluster. Of the 94 stars observed, 17 were resolved into close pairs. The observed separations range from 0.09 arcsec to 6.4 arcsec, corresponding to 40--3000 AU (the latter being a safe upper limit for bound solar-type binaries). We carried out the survey at a single infrared wavelength, in the H band at 1.63 μm. Additional color information will be needed to eliminate field stars and to establish which of the observed doubles are bona fide physical pairs. If the observed binary candidates are true companions, the masses we infer for the secondaries range from 0.09 M&sun; to 1.5 M&sun;, and the mass ratios, q, range from 0.1 to 1.

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