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New Empirical Fitting Functions of the Lick/IDS indices using MILES

Published online by Cambridge University Press:  01 December 2006

J. M. Martín-Hernández ,
E. Mármol-Queraltó ,
J. Gorgas ,
N. Cardiel ,
P. Sánchez-Blázquez ,
A. J. Cenarro ,
R. F. Peletier ,
A. Vazdekis  and
J. Falcón-Barroso
J. M. Martín-Hernández
Affiliation:
Dpto. Astrofísica, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040Madrid, Spain
E. Mármol-Queraltó
Affiliation:
Dpto. Astrofísica, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040Madrid, Spain
J. Gorgas
Affiliation:
Dpto. Astrofísica, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040Madrid, Spain
N. Cardiel
Affiliation:
Dpto. Astrofísica, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040Madrid, Spain
P. Sánchez-Blázquez
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, United Kingdom
A. J. Cenarro
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200, La Laguna, Spain
R. F. Peletier
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, 9700 AV Groningen, The Netherlands
A. Vazdekis
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200, La Laguna, Spain
J. Falcón-Barroso
Affiliation:
Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA, Leiden, The Netherlands
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Abstract

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Here we present new empirical fitting functions for the Lick/IDS line-strength indices as measured in MILES (Medium-resolution INT Library of Empirical Spectra; Sánchez-Blázquez et al., Cenarro et al. 2007). Following previous work in the field (Gorgas et al. 1993; Worthey et al. 1994; Worthey & Ottaviani 1997), these functions describe the empirical behavior of the line-strength indices with the atmospheric stellar parameters. In order to derive the fitting functions we have devised a new procedure which, being fully automatic, provides a better description of the line-strength index variations in the stellar parameter space.

Keywords

stars: abundancesfundamental parameters – galaxies: stellar content – globular clusters: general

References

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Sánchez-Blázquez, P., Peletier, R.F., Jiménez-Vicente, J., Cardiel, N., Cenarro, A.J., Falcón-Barroso, J., Gorgas, J., Selam, S.O., & Vazdekis, A. 2006, MNRAS 371, 703CrossRefGoogle Scholar
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