The low-mass stellar content of galaxies - Constraints through hybrid population synthesis near 1 micron

Details The low-mass stellar content of galaxies - Constraints through hybrid population synthesis near 1 micron The low-mass stellar content of galaxies - Constraints through hybrid population synthesis near 1 micron

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..142c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 142-157.

Astronomy and Astrophysics

Astrophysics

14

Dwarf Stars, Galactic Structure, Giant Stars, Spectral Energy Distribution, Stellar Luminosity, Astronomical Models, Stellar Mass, Stellar Spectra

Scientific paper

High SNR observations are presented for six galaxies and a variety of dwarfs and galactic bulge giants in the 9800-10,200 A spectra range, and the Wing-Ford band of FeH is clearly defined in all galaxies. The whole observed spectral range is used to synthesize galaxy spectra, and a new hybrid population synthesis (HPS) method is used to obtain information on the main sequence mass function compatible with the galaxy data. No strong conclusion concerning the structure of the main sequence luminosity function is reached and no age discrimination is generally possible, but a preferred mass function with a steep slope of 'x' about 3 and a lower mass cutoff of about 0.4 is obtained. It is shown that by fitting the observations of galaxies via the HPS method that no combination of model parameters can produce a luminosity contribution in the I band coming from M dwarfs large than about 20 percent. The total luminosity contribution of the I band coming from all dwarfs could rarely exceed 40 percent.

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