Significant amounts of hydrogen were found in very hot early-type single WN stars in the SMC and the LMC. Recently, we found similar evidence in the Wolf-Rayet star of a short-period LMC binary. We discuss here the relevance of hydrogen for WR star classification, models, the relation to metallicity, and the GRB progenitors.
@article{arxiv.astro-ph/0510612,
title = {The Wolf-Rayet hydrogen puzzle -- an observational point of view},
author = {C. Foellmi and S. V. Marchenko and A. F. J. Moffat},
journal= {arXiv preprint arXiv:astro-ph/0510612},
year = {2007}
}
Comments
5 pages, 2 figures, to appear in proc. of the Tartu Workshop, PASP, eds. Lamers, Langer, Nugis, Annuk