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Classification of Wolf-Rayet stars in NGC 595 in M 33 through high-spatial resolution observations

Published online by Cambridge University Press:  26 May 2016

Pierre Royer ,
Ingemar Lundström  and
Jean-Marie Vreux
Pierre Royer
Affiliation:
Katholieke Universiteit Leuven, Instituut voor Sterrenkunde, Celestijnenlaan 200B, B-3001 Leuven, België
Ingemar Lundström
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sverige
Jean-Marie Vreux
Affiliation:
Institut d'Astrophysique et de Géophysique, University of Liège, 17 Allée du 6 Août, B-4000 Liège 1 (Sart-Tilman), la Belgique

Abstract

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NGC 595 is, after NGC 604, the second most luminous H ii region in the Milky Way's neighbouring spiral galaxy M 33. Its Wolf-Rayet star content has mainly been unveiled by two different channels. On the one hand, the stellar population of NGC 595 has been resolved and its WR stars identified through online/off-line H ii λ4686 observations realised with the HST. Nevertheless, due to the limited number of filters used, this did not give any information on the WR spectral subtypes. On the other hand, spectroscopic observations of NGC 595, realised at optical and ultraviolet wavelengths, have enabled the determination of some spectral subtypes, but this time, the lack of angular resolution did not allow to resolve the whole population. Thanks to our photometric technique, based on five dedicated narrow-band filters, we present here a determination of the spectral subtypes of NGC 595 WR stars which for the first time combines high-angular resolution and high-‘spectroscopic’ discrimination capabilities.

Type
Part 3. Location and Distribution of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 572 - 573
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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