Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..457j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 457-465.
Astronomy and Astrophysics
Astrophysics
96
Infrared Stars, Metallicity, Stellar Luminosity, Stellar Spectra, Atomic Energy Levels, Calcium, Stellar Temperature, Titanium Oxides
Scientific paper
The authors study the properties of the Ca II infrared triplet (Ca T) from a sample of Reticon spectra of 62 stars. The stars range over spectral types B though mid-M, and the sample spans some four orders of magnitude in gravity g, and almost a factor of 10 in metallicity. It is found that, over all spectral types, from F to mid-M, and over this large gravity interval, the equivalent width of Ca T correlates strongly with log g. This is an almost one-valued relation, being relatively insensitive to metallicity. Thus, since most of the light from galaxies is thought to come from G and K stars, the Ca T feature should be a useful tool for constraining the dwarf: giant ratio of the light-dominant stellar population. Existing measurements of Ca T are applied in an analysis of the stellar content in the nucleus of M31.
Alloin D. M.
Jones Bernard J. T.
Jones Janet E.
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