Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l.119f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 15, 1988, p. L119-L123. Research supported by the Natio
Astronomy and Astrophysics
Astrophysics
52
Brown Dwarf Stars, Companion Stars, Infrared Stars, M Stars, Chromosphere, H Alpha Line, Main Sequence Stars, Spectral Energy Distribution, Stellar Atmospheres, Stellar Spectra
Scientific paper
A faint cool companion to Gliese 569, discovered during an IR imaging survey of nearby stars, may be the lowest-mass stellar object yet found. The companion is somewhat cooler in its 1.65-3.75-micron energy distribution than the coolest known main-sequence stars, indicating a low mass. Despite its lower temperature, it is more luminous than similar extremely low-mass stars, suggesting that it is either a young low-mass star evolving toward the main sequence or a cooling substellar brown dwarf. The primary star has emission lines and a low space velocity and exhibits flaring, all of which imply youth for this system. Observations of Gliese 569 and its companion over a period of 2 yr confirm the common proper motion expected of a true binary. The 5-arcsec apparent separation (50 AU) implies an orbital period of roughly 500 yr, which will permit an eventual direct determination of the mass of the companion.
Forrest William John
Shure Mark
Skrutskie Michael F.
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