Discovery of an ultra-cool subdwarf: LSR1425+7102, first star with spectral type sdM8.0
arXiv:astro-ph/0301375 · doi:10.1086/374210
Abstract
We report the discovery of the coolest subdwarf reported to date. The star LSR1425+7102 was discovered in our survey for faint high proper motion stars in the northern sky. Follow-up spectroscopy revealed the star to be a very red object with the characteristic signature of M subdwarfs: strong CaH bands but relatively weaker TiO bands. The CaH molecular band at 6900Å is particularly strong. By extrapolating the empirical relationship between the strength of the CaH molecular band and the subdwarf subtype, we conclude that LSR1425+7102 is the first star to be discovered with spectral type sdM8.0.
7 pages, 1 table, 3 figures, Ssbmitted to the Astrophysical Journal Letters
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