Query : 2004A&A...419L..17C

2004A&A...419L..17C - Astronomy and Astrophysics, volume 419, L17-20 (2004/5-4)

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


Abstract (from CDS):

We have surveyed the metal-rich spiral galaxy M 83 (NGC 5236) for its Wolf-Rayet population using VLT-FORS2 narrow-band imaging and follow-up spectroscopy. From a total of 280 candidates identified using HeII λ4686 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 M 83 with N(WC8-9)/N(WC4-7)=9 which we attribute to the sensitivity of the classification line CIII λ5696 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.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M 83 - stars: Wolf-Rayet

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11379 1
2 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2310 2

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