M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale

Details M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale

1996-11-26

arxiv.org/abs/astro-ph/9611222v1

Astron.J.113:806-822,1997

Astronomy and Astrophysics

Astrophysics

AASTeX, 43 pages, 11 figures, A.J. accepted

Scientific paper

10.1086/118302

We present a spectroscopic classification system for M-dwarfs and M-subdwarfs based on quantitative measures of TiO and CaH features in the region 6200 - 7400 Angstroms. Our sample of cool stars covers the range from solar metallicity stars to the most extreme subdwarfs known. Using synthetic spectra computed by Allard and Hauschildt (1995), we derive metallicities for the stars. Stars are classified as dwarfs (M V), subdwarfs (sdM), or extreme subdwarfs (esdM). These classifications correspond to [m/H] ~ 0.0, -1.2, and -2.0 respectively. Our metallicity scale agrees with theoretical HR diagrams and HST globular cluster measurements. We discuss some nearby subdwarfs of particular interest in light of our metallicity scale.

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