M dwarfs : band strengths in halo and disk populations

Scanner measurements of TiO and CaH bands are interpreted using model atmospheres to yield information on the abundance, and gravity of M dwarfs of different kinematic populations. If the O/C ratio is solar in the halo, a number of M subdwarfs in the present study are metal deficient by only 0.5 to...

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Veröffentlicht in:Astrophys. J.; (United States) 1976-07, Vol.207, p.535
1. Verfasser: Mould, J. R.
Format: Artikel
Sprache:eng
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Zusammenfassung:Scanner measurements of TiO and CaH bands are interpreted using model atmospheres to yield information on the abundance, and gravity of M dwarfs of different kinematic populations. If the O/C ratio is solar in the halo, a number of M subdwarfs in the present study are metal deficient by only 0.5 to 1.0 dex. In the redder young disk stars weaker, CaH suggest a gravity lower than that on the old disk main sequence. Blanketing by TiO is shown to give a marked bundance dependence to R: I in M dwarfs. (AIP)
ISSN:0004-637X
1538-4357
DOI:10.1086/154521