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EDP Sciences, Astronomy & Astrophysics, 2(419), p. L17-L20, 2004

DOI: 10.1051/0004-6361:20040128

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An exceptional population of late-type WC stars in the metal-rich spiral galaxy M 83

Journal article published in 2004 by Paul A. Crowther ORCID, Lucy J. Hadfield, Hans Schild, Werner Schmutz ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We have surveyed the metal-rich spiral galaxy M83 (NGC5236) for its Wolf-Rayet population using VLT-FORS2 narrow-band imaging and follow-up spectroscopy. From a total of 280 candidates identified using HeII 4686 imaging, Multi Object Spectroscopy of 198 sources was carried out, revealing 132 objects containing bona-fide Wolf-Rayet features. From this sample, an exceptional W-R content of 1030 is inferred, with N(WC)/N(WN)=1.3, continuing the trend to larger values at higher metallicity amongst Local Group galaxies. More dramatic is the dominance of late-type WC stars in M83 with N(WC8-9)/N(WC4-7)=9 which we attribute to the sensitivity of the classification line CIII 5696 to mass-loss, providing the strength of WC winds scale with metallicity. One young massive compact cluster, #74 in our catalogue, hosts 20% of the entire galactic population, namely 180 late WC stars and 50 late WN stars. Comment: 4 pages, 2 figures, revised manuscript, accepted by A&A Letters