Near-infrared luminosity-sensitive features in M dwarfs and giants, and in M31 and M32
Observations are presented of prominent near-infrared spectral features in M dwarfs and M giants which elucidate the behavior of these features (8183-8195 Å doublet of Na i, the Ca ii triplet, 9910 Å FeH band, and TiO bands) as a function of luminosity and effective temperature. These spectral features have been measured from near-infrared spectra of the nuclei of M31 and M32. A luminosity function similar to that of the solar neighborhood is supported by our observations. Our measurements indicate an enhancement of metallicity in the nucleus of M31 as compared with that of M32.
Additional Information© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1977 July 25; accepted 1977 November 3. We are grateful to J. A. Frogel for advice and suggestions during the course of this work and to R. Lynds and E. Jensen for help in picture processing techniques. Operated by AURA, Inc., under NSF contract AST 74-04129.
Published - 1978ApJ___221__788C.pdf