Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..759a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 1, 1986, p. 759-780.
Astronomy and Astrophysics
Astronomy
13
Astronomical Spectroscopy, Elliptical Galaxies, Infrared Spectra, Mass To Light Ratios, Star Distribution, Absorption Spectra, Carbon Monoxide, Cool Stars, Dwarf Stars, Giant Stars, Late Stars, Main Sequence Stars
Scientific paper
Medium-resolution infrared CVF spectra of the 2.3-micron CO absorption feature sensitive to stellar luminosity class is obtained for a sample of elliptical galaxies and standard stars. These are the highest-quality spectra of this feature published and have the potential of determining relative numbers of late-type giants and cool main-sequence dwarfs in elliptical galaxies more accurately than previous narrow-band filter measurements. A synthesis technique based on data on Baade's window is introduced to investigate the limits on numbers of low-mass stars. Systematic uncertainties in the synthesis are introduced by inadequate knowledge about Baade's window, while the main statistical uncertainty due to the large errors on published broadband colors of elliptical galaxies. Synthesis based on a narrow-band filter CO index is found to suffer from uncertain K corrections and difficulties with the continuum determination. Resulting mass-to-light ratios are M/L (solar bolometric) = 2.5-5.0.
Arnaud A. A. K.
Gilmore Gerard
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