Abstract
Although the very cool stars known as brown dwarfs have been well studied theoretically, there is relatively little astronomical evidence supporting their existence. Observations by a team of astronomers at the University of Minnesota, US, could significantly change this situation. Claia Bryja and her colleagues have detected several very cool, low-luminosity stars in the Hyades cluster (in the Taurus constellation), seven of which they believe are brown dwarfs (Astrophys. J. Lett. (1992) 388 L23). The discovery of these objects strengthens the hypothesis that brown dwarfs are numerous, and that they may indeed comprise a significant fraction of the “dark matter” that has been inferred to exist throughout the Universe.
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