SDSS J125637-022452: a high proper motion L subdwarf

Details SDSS J125637-022452: a high proper motion L subdwarf SDSS J125637-022452: a high proper motion L subdwarf

2009-01-22

arxiv.org/abs/0901.3382v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 2 figures. Accepted for ApJL

Scientific paper

10.1088/0004-637X/694/2/L140

We report the discovery of a high proper motion L subdwarf ($\mu$ =0.617arcsec/yr) in the Sloan Digital Sky Survey spectral database. The optical spectrum from the star SDSS J125637-022452 has mixed spectral features of both late-M spectral subtype (strong TiO and CaH at 7000A) and mid-L spectral subtype (strong wings of KI at 7700A, CrH and FeH), which is interpreted as the signature of a very low-mass, metal-poor star (ultra-cool subdwarf) of spectral type sdL. The near infrared (NIR) (J-Ks) colors from 2MASS shows the object to be significantly bluer compared to normal L dwarfs, which is probably due a strong collision induced absorption (CIA) due to H2 molecule. This is consistent with the idea that CIA from H2 is more pronounced at low metallicities. Proper motion and radial velocity measurements also indicate that the star is kinematically "hot" and probably associated with the Galactic halo population.

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