Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186...49b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 49-63.
Astronomy and Astrophysics
Astrophysics
134
Astronomical Spectroscopy, Galactic Nuclei, Infrared Spectra, Near Infrared Radiation, Star Clusters, Data Reduction, Galactic Structure, Metallicity, Milky Way Galaxy, Spectral Resolution, Tables (Data)
Scientific paper
The authors present near-infrared CCD spectra with 12.5 Å resolution for 30 star clusters having known ages, metallicities and reddenings. They also observed a sample of 62 nuclei in galaxies of all morphological types. They measure the continuum distribution and the equivalent widths of 13 absorption features for star cluster and galactic nuclei. Analysis of the star cluster sample shows that in the near-infrared, metallicity is the dominant parameter. Age effects in blue clusters disturb the relationship for molecular bands. In view of population synthesis of galactic nuclei, the authors present star cluster grid predictions as a function of age and metallicity for 5 metallic windows and the continuum distribution. Strong-lined globular clusters like NGC 6528 have integrated spectra comparable to those of massive galaxies. Consequently, they are important tools for population synthesis. Strong-lined spectra are observed in the central regions of both spiral galaxies and luminous elliptical galaxies, suggesting a comparable metal content. Even very blue galaxies exhibit, in the near-infrared, spectra quite similar to those observed for the rest of the galaxy sample.
Alloin Danielle
Bica Eduardo
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