Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jrasc..84..166d&link_type=abstract
Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 84, June 1990, p. 166-174.
Astronomy and Astrophysics
Astronomy
Carbon Monoxide, Cyanogen, Globular Clusters, Infrared Absorption, Infrared Spectra, Interstellar Extinction, Andromeda Galaxy, Asymptotic Giant Branch Stars, Galactic Evolution, Halos, Near Infrared Radiation, Red Giant Stars
Scientific paper
Intermediate resolution spectra in the wavelength region 1.6 to 2.4 microns have been obtained of four luminous M31 clusters. The mean M31 cluster spectrum is compared with spectra of Galactic globular clusters and elliptical galaxies. It is concluded that the CO bands in the mean M31 cluster spectrum have strengths consistent with the metallicities of the clusters. However, the CN bands at 2 microns appear to be enhanced. Burstein et al. (1984) have found CN to be abnormally strong in the blue spectra of luminous M31 clusters, and it is suggested that some sort of primordial enrichment may be required to explain the presence of CN enhancement over a broad range of wavelengths.
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