Status Report

Discovery of an ultra-cool subdwarf: LSR1425+7102, first star with spectral type sdM8.0

By SpaceRef Editor
January 21, 2003
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Astrophysics, abstract
astro-ph/0301375


From: Sebastien Lepine <[email protected]>
Date: Fri, 17 Jan 2003 23:13:50 GMT (48kb)

Discovery of an ultra-cool subdwarf: LSR1425+7102, first star with
spectral type sdM8.0


Authors:
Sebastien Lepine,
Michael M. Shara,
R. Michael Rich

Comments: 7 pages, 1 table, 3 figures, Ssbmitted to the Astrophysical Journal
Letters


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 $approxlambda$6900AA
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.

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