2003/01/17 by Sébastien Lépine, Sebastien Lepine, Michael M. Shara +1 · 1 citation
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Physics #Proper motion #Sky #Spectral signature #Stars #Stellar classification #Stellar, planetary, and galactic studies #Subdwarf #White dwarf #astro-ph
paper · pdf · doi:10.1086/374210
published as Astrophys.J.585:L69-L72,2003 · 7 pages, 1 table, 3 figures, Ssbmitted to the Astrophysical Journal Letters
arxiv created 2003/01/17 · openalex publication_date 2003/03/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the discovery of the coolest subdwarf reported to date. The star LSR 1425+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 ≈6900 Å is particularly strong. By extrapolating the empirical relationship between the strength of the CaH molecular band and that of the subdwarf subtype, we conclude that LSR 1425+7102 is the first star to be discovered with spectral type sdM8.0.