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Analysis of stellar populations with large empirical libraries at high spectral resolution

Published online by Cambridge University Press:  01 December 2006

Philippe Prugniel ,
Mina Koleva ,
Pierre Ocvirk ,
Damien Le Borgne  and
Caroline Soubiran
Philippe Prugniel*
Affiliation:
Université Lyon 1, Observatoire de Lyon, St. Genis Laval, F-69230, France; CNRS UMR5574 Observatoire de Paris, GEPI, F-75014, France
Mina Koleva
Affiliation:
Université Lyon 1, Observatoire de Lyon, St. Genis Laval, F-69230, France; CNRS UMR5574 Department of Astronomy, St. Kl. Ohridski University of Sofia, BG-1164 Sofia, Bulgaria
Pierre Ocvirk
Affiliation:
CEA Saclay/Service d'Astrophysique, Gif-sur-Yvette Cedex, F-91191, France
Damien Le Borgne
Affiliation:
CEA Saclay/Service d'Astrophysique, Gif-sur-Yvette Cedex, F-91191, France
Caroline Soubiran
Affiliation:
Observatoire de Bordeaux, F-33270, Floirac, France
*
†[email protected]
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Abstract

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The stellar population models dramatically progressed with the arrival of large and complete libraries, ELODIE, CFLIB (=Indo-US) and MILES at a relatively high resolution. We show that the quality of the fits is not anymore limited by the size of the stellar libraries in a large range of ages (0.1 to 10 Gyr) and metallicities (−2 to +0.4 dex). The main limitations of the empirical stellar libraries are (i) the coverage of the parameter space (lack of hot stars of low metallicity), (ii) the precision and homogeneity of the atmospheric parameters and (iii) the non-resolution of individual element abundances (in particular [α/Fe]). Detailed abundances measurements in the large libraries, and usage of theoretical libraries are probably the next steps, and we show that a combination between an empirical (ELODIE) and a theoretical library (Coelho et al. 2005) immediately improves the modeling of (α-enhanced) globular clusters.

Keywords

galaxies: abundancesglobular clusters: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 68 - 72
Copyright
Copyright © International Astronomical Union 2007

References

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