期刊
ASTRONOMY & ASTROPHYSICS
卷 427, 期 1, 页码 L1-L4出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:200400069
关键词
very low mass stars; brown dwarfs; binary stars
We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far in our adaptive optics survey of all known M dwarfs within 12 pc, and it lies at the stellar/substellar limit. Given the assumed age of the primary star, the companion is likely an extremely low mass star. The long orbital period of G 239-25 AB (approximate to 100 years) precludes a direct mass determination, but the relatively wide angular separation will allow detailed analyses of its near infrared and visible spectra.
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