A Near Infrared Search for Very Low Mass Companions to Hyades Stars using the W. M. Keck Telescope

Details A Near Infrared Search for Very Low Mass Companions to Hyades Stars using the W. M. Keck Telescope A Near Infrared Search for Very Low Mass Companions to Hyades Stars using the W. M. Keck Telescope

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912005m&link_type=abstract

American Astronomical Society, 189th AAS Meeting, late abstracts, #120.05; Bulletin of the American Astronomical, Vol. 29, p. 73

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Using the 10-m W.M. Keck telescope we carried out a near-infrared search for brown dwarf companions to a total of 25 late-M dwarfs and white dwarfs in the Hyades cluster. We were sensitive to M-dwarf companions at separations as small as 0.3" and brown dwarf companions from 0.45". Four very low mass stellar companions were found, but we detected no brown dwarfs. An earlier wide-field survey of 192 Hyades stars detected only one companion, RHy 299B. With an absolute K magnitude of 9.3 this is the lowest-mass Hyades star known. All these companions, as well those seen by Gizis and Reid (1995 AJ 110, 1248) are within 200 AU of their Hyades primary. This shows that the Hyades is deficient of wide binaries compared to field stars; if the Hyades followed the Duquennoy and Mayor (1991 A&A 248, 485) distribution we would have seen 10 5-100" binaries in our wide-field survey. This is most likely due to collisions disrupting soft binary systems. The non-detection of brown dwarfs allows us to constrain the Hyades initial mass function to be flat or declining between 0.2 and 0.025 solar masses.

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