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arXiv:astro-ph/0403636 (astro-ph)
[Submitted on 29 Mar 2004 (v1), last revised 6 Apr 2004 (this version, v2)]

Title:An exceptional population of late-type WC stars in the metal-rich spiral galaxy

Authors:Paul Crowther (Sheffield), Lucy Hadfield (Sheffield), Hans Schild (Zurich), Werner Schmutz (Davos)
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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.
Comments: 4 pages, 2 figures, revised manuscript, accepted by A&A Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403636
  (or arXiv:astro-ph/0403636v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403636
Journal reference: Astron.Astrophys. 419 (2004) L17
Related DOI: https://doi.org/10.1051/0004-6361%3A20040128

Submission history

From: Dr Paul A. Crowther [view email]
[v1] Mon, 29 Mar 2004 18:41:36 UTC (121 KB)
[v2] Tue, 6 Apr 2004 10:36:18 UTC (123 KB)
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