A minimization procedure applied to population synthesis in galaxy nuclei using a star cluster library - M31, M32

Details A minimization procedure applied to population synthesis in galaxy nuclei using a star cluster library - M31, M32 A minimization procedure applied to population synthesis in galaxy nuclei using a star cluster library - M31, M32

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157...79s&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

4

Andromeda Galaxy, Elliptical Galaxies, Galactic Nuclei, Star Clusters, Metallicity, Stellar Evolution, Stellar Spectra

Scientific paper

The MINOS optimization system is applied to the population synthesis of galactic nuclei, using a grid of star cluster equivalent widths as a function of age and metallicity. For some classes of red galaxy nuclei, this observational approach to population synthesis produces results similar to those predicted by the theoretical approach of Arimoto and Yoshii (1987). The synthesis results for blue nuclei tends to scatter more in the age vs metallicity plane, probably because only visible and near-infrared spectral data are used. However, strong bursts of star formation can easily be identified. In this contribution, population synthesis is provided for the central regions of M31 and M32. The bulge and the semistellar nucleus of M31 are dominated by the old metal-rich population. In the central region of M32, a metallicity up to the solar value has been reached, and the synthesis indicates that the intermediate age component is not dominant.

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