M Subdwarf Secondaries: A Test of the Metallicity Scale | Zendy

John E. Gizis | Zendy; I. Neill Reid | Zendy

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M Subdwarf Secondaries: A Test of the Metallicity Scale

Author(s) -

John E. Gizis,

I. Neill Reid

Publication year - 1997

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/134000

Subject(s) - subdwarf , astrophysics , physics , astronomy , metallicity , scale (ratio) , stars , white dwarf , quantum mechanics

We present spectra of three M subdwarfs which are common proper motioncompanions to F or G subdwarfs of known metallicity. The assumption that thecompanions have the same composition allows us to test the Gizis (1997, AJ,113, 806) M subdwarf classification system and its correspondence tometallicity. The results are in excellent agreement with the Gizis (1997)scale, thereby showing that the Allard & Hauschildt (1995, ApJ, 445, 433)Extended model atmospheres agree well in the 6200 -- 7400 Angstrom region forcool metal-poor stars. We also show that the results are consistent with themain sequences of globular clusters using the Reid (1997, AJ, 114, 161)distance scale.Comment: 10 pages, 3 figures, AASTeX, to appear in the November 1997 PAS

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