The dwarf star content of elliptical and lenticular galaxies

Details The dwarf star content of elliptical and lenticular galaxies The dwarf star content of elliptical and lenticular galaxies

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..637c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 637-650.

Astronomy and Astrophysics

Astrophysics

46

Dwarf Stars, Elliptical Galaxies, Lenticular Bodies, Main Sequence Stars, Near Infrared Radiation, Stellar Spectra, Galactic Structure, Late Stars, Mass To Light Ratios, Metallicity, Stellar Luminosity

Scientific paper

Near-IR spectra of 14 galaxies are analyzed to determine accurate lower main-sequence dwarf light contributions and to set limits on the mass-to-light (M/L) ratios. While dwarf light contributes 30-50 percent of the total at 8200 A, low measured FeH indices preclude contributions of more than 15 percent to the integrated light at 9900 A from late M dwarfs. M/L ratios of about 6 are found, consistent with dynamical estimates. The brighter galaxies exhibit substantial gradients in the equivalent width of the Na I feature. This is at least partly due to metal abundance gradients also reflected in the TiO index, but there is some evidence for concentrations of metal-rich dwarfs toward the centers of giant galaxies.

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