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A search for brown dwarfs and late M dwarfs in the Hyades and the Pleiades
Zuckerman, B.; Becklin, E. E.
AA(California, University, Los Angeles), AB(Hawaii, University, Honolulu)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. L99-L102. Research supported by the University of California. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Brown Dwarf Stars, Cool Stars, Galactic Clusters, Infrared Sources (Astronomy), K Lines, Stellar Evolution, White Dwarf Stars, Computational Astrophysics, Infrared Imagery, Infrared Telescopes, Space Density, Surface Temperature
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The J and K colors of 14 white dwarfs that are believed to be single stars and members of either the Hyades or Pleiades clusters or the Hyades supercluster were measured, and no indication of any excess 2.2 micron (K) emission above that expected from the white dwarf was found. Based on recently published theoretical cooling curves for brown dwarfs, the existence of any cool companion stars, with masses greater than approximately 0.03 solar mass within a radius of 6 arcsec of eight white dwarfs in the Hyades cluster and greater than approximately 0.015 solar mass toward the single white dwarf in the Pleiades, is ruled out. This latter limit, only 15 Jupiter masses, is probably the lowest that has yet been established for any star by purely infrared techniques.

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