Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..735t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 735-758. Research supported by the ARCS Foundation.
Astronomy and Astrophysics
Astronomy
42
Andromeda Galaxy, Astronomical Spectroscopy, Globular Clusters, Metallicity, Balmer Series, Charge Coupled Devices, Chemical Evolution, Cn Emission, Dwarf Stars, Luminosity
Scientific paper
Integrated CCD spectra in the 3850-4200 A region were obtained for nine metal-rich globular clusters in M31. The spectra are analyzed using the reddening-free spectral-classification system of Rose (1984). The data are combined with data obtained by Rose and Tripicco (1986) for nine metal-rich Galactic globular clusters and with spectra of 72 stars with well-determined atmospheric parameters. It is found that the 4000 A light from metal rich M31 globulars is dominated by dwarfs, while giants and dwarfs contribute equally to the light from the mean of the metal-rich Galactic globulars. The contribution of early-type stars to the 400 A light from M31 clusters is less than 5 percent in most cases. Also, the 3883 and 4216 CN bands in the M31 globulars are very strong for their integrated spectral types. The results suggest that the metal-rich M31 globular clusters are much younger than Galactic metal-rich clusters like 47 Tuc or M71.
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