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New response functions for absorption-line indices from high-resolution spectra

Published online by Cambridge University Press:  01 December 2006

R. Tantalo ,
C. Chiosi  and
L. Piovan
R. Tantalo
Affiliation:
Department of Astronomy, University of Padova, Vicolo dell'Osservatorio, 3 35122 Padova, Italy email: [email protected]
C. Chiosi
Affiliation:
Department of Astronomy, University of Padova, Vicolo dell'Osservatorio, 3 35122 Padova, Italy email: [email protected]
L. Piovan
Affiliation:
Department of Astronomy, University of Padova, Vicolo dell'Osservatorio, 3 35122 Padova, Italy email: [email protected]
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Abstract

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Using a huge library of 1-Å resolution spectra over a wide range of log Teff, log g and [Fe/H] and for both solar and α-enhanced abundance ratios [α/Fe], we derive the response functions (s) which are commonly used to correct indices with solar α-enhanced ratios to indices with α-enhanced>0. The s vary not only with the type of star but also with metallicity. With the aid of this and the fitting functions (s), we derive the indices for single stellar populations. The new indices for single stellar populations are used to derive the age, metallicity, and degree of enhancement first for sample of Galactic globular clusters for which these key parameters have been independently derived from the colour-magnitude diagram and/or spectroscopic studies, and second to study the classical two index diagram.

Keywords

galaxies: evolutiongalaxies: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 143 - 146
Copyright
Copyright © International Astronomical Union 2007

References

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