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Young Stellar Populations in M31, M33, and NGC 6822

Published online by Cambridge University Press:  25 May 2016

J. B. Hutchings ,
B. Cavanagh ,
L. Bianchi ,
R. Chandar  and
S. Scuderi
J. B. Hutchings
Affiliation:
DAO/HIA/NRC, Victoria, Canada
B. Cavanagh
Affiliation:
DAO/HIA/NRC, Victoria, Canada
L. Bianchi
Affiliation:
Johns Hopkins University, Baltimore, MD, USA
R. Chandar
Affiliation:
Johns Hopkins University, Baltimore, MD, USA
S. Scuderi
Affiliation:
Catania Observatory, Catania, Italy

Abstract

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We have been pursuing a program of hot star UV spectroscopy in local group galaxies over several years with HST. We have also obtained WFPC2 images in parallel and pointed exposures with several broad band filters.

• The imaging data have been used to generate colour-magnitude plots of central fields, clusters and halo fields in M31, M33 and NGC 6822. We have compared these with high-mass model isochrones from recent models, to examine the stellar populations that are indicated. M33 contains a substantial young cluster population whose mass and age appear to be related. The western outer wisps of NGC 6822 contain a relatively young population of stars.

• Most of the spectra have been reported and modelled in published papers: we note here the first comparison of stars in NGC 6822 with others from local group galaxies.

• We have also discussed the interstellar extinction in M31 and find it is similar to the Galaxy after allowance for comparable amounts of halo extinction that resembles that of the Magellanic Clouds.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 263 - 267
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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