Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..561d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Feb. 1990, p. 561-571.
Astronomy and Astrophysics
Astronomy
27
Elliptical Galaxies, Galactic Nuclei, Infrared Spectroscopy, Near Infrared Radiation, Absorption Spectra, Spectral Bands, Telescopes
Scientific paper
Near-infrared spectra, spanning the wavelength range 1.6-2.4 microns, of the Local Group elliptical M32 were obtained at the f/36 focus of the CFH Telescope during the night of September 24/25, 1988. The strongest features were identified as absorption bands of CO, CN, and H2O. The M32 observations were modeled, with results indicating that the M32 galaxy contains a population of cool giants in excess of that present on the red giant branch. This population contributes about 60 percent of the 2-micron flux, and is apparently dominated by late M giants, suggesting evolution on the asymptotic giant branch (AGB) and not the horizontal branch. The contribution of AGB stars to the 2-micron flux is roughly twice what would be expected from an old coeval population, suggesting a presence of an intermediate-age component.
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