Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217...57a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 57-65.
Astronomy and Astrophysics
Astronomy
49
Galactic Nuclei, Infrared Astronomy, Line Spectra, Star Clusters, Stellar Spectra, Andromeda Galaxy, Calcium, D Lines, Dwarf Stars, Galactic Bulge, Metallicity, Sodium, Spectrum Analysis
Scientific paper
A comparative study is made of the near-infrared Na I doublet and the Ca II triplet, among sets of stars, star clusters and galaxy nuclei. In particular, the semistellar nucleus of M31 is studied. Evidence is found that the enhancement of the absorption feature around 8200 A in galaxy nuclei is not due to a strengthening of the Na I lines, but rather to another absorber, possibly a molecular band at about 8205 A which varies strongly with Theta(eff) and metallicity. Therefore, an alternative explanation to the classical discussion about dwarf/giant star content in M31, is that of an increased metallicity in the semistellar nucleus of M31, with respect to its bulge or to the nucleus of M32. A similar result is found from molecular bands in the visible part of the spectrum, like CN and C2 which show highly nonlinear dependences on the metallicity.
Alloin Danielle
Bica Eduardo
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