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Wolf-Rayet stars in I Zw 18

Published online by Cambridge University Press:  25 May 2016

Francoid Legrand ,
Daniel Kunth ,
Jean-René Roy ,
J. Miguel Mas-Hesse  and
Jeremy R. Walsh
Francoid Legrand
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98bis boulevard Arago, F-75014 Paris, France
Daniel Kunth
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98bis boulevard Arago, F-75014 Paris, France
Jean-René Roy
Affiliation:
Dépratement de Physique, Université Laval, Quebec, PQ G1K 74, Canada
J. Miguel Mas-Hesse
Affiliation:
LAEFF-INTA, P.O. Box 50727, E-28080 Madrid, Spain
Jeremy R. Walsh
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany

Abstract

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Wolf-Rayet stars have been detected in the NW region of the metal–poor starburst galaxy I Zw 18. The integrated luminosity and FWHM of the bumps at 4650 Å and 5808 Å are consistent with the presence of a few individual stars of WC4 or WC5 type. The unexpected presence of WC stars in such a low-metallicity galaxy could, however, be explained by high mass loss rates, or alternatively favor a binary channel for WR formation. WC stars could also account for the strong and narrow He II 4686Å emission line which peaks co-spatially with the WR bump emission (see Schaerer 1996).

Type
Part 5. Wolf-Rayet stars and other massive stars in starburst galaxies: the case of Wolf-Rayet galaxies (integrated spectra)
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 606 - 607
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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