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The Spectra of Bright Near-IR Clusters in M82

Published online by Cambridge University Press:  30 March 2016

A. Lançon ,
M. Mouhcine ,
E. Chané ,
L.J. Smith ,
J.S. Gallagher ,
N. Förster Schreiber ,
W. Vacca ,
R. de Grijs  and
R.W. O’Connell
A. Lançon
Affiliation:
Observatoire de Strasbourg (UMR 7550), France
M. Mouhcine
Affiliation:
Observatoire de Strasbourg (UMR 7550), France
E. Chané
Affiliation:
Observatoire de Strasbourg (UMR 7550), France
L.J. Smith
Affiliation:
University College London, UK
J.S. Gallagher
Affiliation:
University of Maddison, Wisconsin, USA
N. Förster Schreiber
Affiliation:
Leiden University, The Netherlands
W. Vacca
Affiliation:
NASA Ames Research Centre, USA
R. de Grijs
Affiliation:
Sheffield University, UK
R.W. O’Connell
Affiliation:
University of Virginia, USA

Abstract

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Based on new spectra spanning wavelengths from 0.8 to 2.4μm, we study the properties of bright near-IR clusters in M82. We focus on age and extinction, which are critical parameters when one uses dynamical masses to constrain the stellar IMF. The modelling of red supergiant evolution by various authors leads to very significant differences in synthetic cluster spectra. Near-IR fluxes alone therefore do not rule out a normal IMF for cluster F, previously found to be deficient in low mass stars. Combined optical and near-IR studies are being undertaken.

Type
JD6: Extragalactic Globular Clusters & Their Host Galaxies
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 203
Copyright
Copyright © Astronomical Society of Pacific 2005