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

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

2007-04-03

arxiv.org/abs/0704.0401v1

Astronomy and Astrophysics

Astrophysics

Proceedings of IAU Symp. 241 on Stellar Populations as Building Blocks of Galaxies, ed. A. Vazdekis et al. (2007). 4 pages, 6

Scientific paper

10.1017/S1743921307007673

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 using fits to their near-IR spectra with new PHOENIX model 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 M82 can be reproduced very well from 0.5 to 2.4 micrometers. We warn of remaining uncertainties in cluster ages.

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