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Wolf-Rayet nebulae as tracers of stellar ionizing fluxes: I. M1-67 by Crowther, P. A.; Pasquali, A.; De Marco, O.; Schmutz, W.; Hillier, D. J.; de Koter, A. is a scholarly article available to read on EtoBox.

What is Wolf-Rayet nebulae as tracers of stellar ionizing fluxes: I. M1-67 about?

We use WR124 (WN8h) and its associated nebula M1-67, to test theoretical non-LTE models for Wolf-Rayet (WR) stars. Lyman continuum ionizing flux distributions derived from a stellar analysis of WR124, are compared with nebular properties via photo-ionization modelling. Our study demonstrates the significant role that line blanketing plays in affecting the Lyman ionizing energy distribution of WR stars, of particular relevance to the study of HII regions containing young stellar populations. We confirm previous results that non-line blanketed WR energy distributions fail to explain the observed nebular properties of M1-67, such that the predicted ionizing spectrum is too hard. A line blanketed analysis of WR124 is carried out using the method of Hillier & Miller (1998), with stellar properties in accord with previous results, except that the inclusion of clumping in the stellar wind reduces its wind performance factor to only approx2. The ionizing spectrum of the line blanketed model is much softer than for a comparable temperature unblanketed case, such that negligible flux is emitted with energy above the HeI 504 edge. Photo-ionization modelling, incorporating the observed radial

Author

Crowther, P. A.; Pasquali, A.; De Marco, O.; Schmutz, W.; Hillier, D. J.; de Koter, A.

Published

1999

Language

EN