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Wolf-Rayet stars in I Zw 18

Published online by Cambridge University Press:  25 May 2016

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)
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

De Mello, D.F., Schaerer, D., Heldman, J., Leitherer, C. 1998, ApJ 507, 199 CrossRefGoogle Scholar
Izotov, Y., Foltz, C.B., Green, R.F., Guseva, N.G., Thuan, T.X. 1997, ApJ 487, L37 CrossRefGoogle Scholar
Legrand, F., Kunth, D., Roy, J.-R., Mas-Hesse, J.M., Walsh, J.R. 1997, A&A 326, L17 Google Scholar
Schaerer, D. 1996, ApJ 467, L17 CrossRefGoogle Scholar
Smith, L.F. 1991, in: van der Hucht, K.A. & Hidayat, B. (eds.), Wolf-Rayet Stars and Interrelations with Other Massive Stars in Galaxies, Proc. IAU Symp. No. 143 (Dordrecht: Kluwer), p. 601 CrossRefGoogle Scholar
Stasiñska, G., Leitherer, C. 1996, ApJS 107, 661 CrossRefGoogle Scholar
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