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Modelling the Near-IR Spectra of Red Supergiant-dominated Populations

Published online by Cambridge University Press:  01 December 2006

Ariane Lançon ,
Jay S. Gallagher ,
Richard de Grijs ,
Peter Hauschildt ,
Djazia Ladjal ,
Mustapha Mouhcine ,
Linda J. Smith ,
Peter R. Wood  and
Natascha Förster Schreiber
Ariane Lançon
Affiliation:
Observatoire de Strasbourg (UMR 7550), 11 rue de l'Université, 67000 Strasbourg, France email: lancon@astro.u-strasbg.fr
Jay S. Gallagher
Affiliation:
Dept. of Astronomy, 5534 Sterling, University of Wisconsin, Madison, WI 53706, USA
Richard de Grijs
Affiliation:
Dept. of Physics & Astronomy, University of Sheffield, Hicks Building, Honusfield Rd., Sheffield S3 7RH, UK
Peter Hauschildt
Affiliation:
Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
Djazia Ladjal
Affiliation:
Institute of Astronomy, Katholieke Universiteit, Celestijnenlaan 200 B, 3001 Leuven, Belgium
Mustapha Mouhcine
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK
Linda J. Smith
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Peter R. Wood
Affiliation:
RSAA, Mt Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611, Australia
Natascha Förster Schreiber
Affiliation:
MPI für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany
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Abstract

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We report on recent progress in the modelling of the near-IR spectra of young stellar populations, i.e. populations in which red supergiants (RSGs) are dominant. First, we discuss the determination of fundamental parameters of RSGs from Phoenix model fits to their near-IR spectra; RSG-specific surface abundances are accounted for and effects of the microturbulence parameter are explored. New population synthesis predictions are then described and, as an example, it is shown that the spectra of young star clusters in M 82 can be reproduced very well from 0.5 to 2.4 μm. We warn of remaining uncertainties in cluster ages.

Keywords

galaxies: stellar contentgalaxies: starburstgalaxies: star clustersgalaxies: individual (M82)infrared: galaxiesinfrared: starsstars: supergiants
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 152 - 155
Copyright
Copyright © International Astronomical Union 2007

References

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