Are Wolf-Rayet Stellar Winds Driven by Radiation Forces? Academic Article uri icon

abstract

  • We derive a formal condition for an existence of a critical point in optically thick flows. Using recent synthetic quantitative spectroscopy results and recent OPAL opacities we find that Wolf-Rayet stars (of the WRC type and part of the WRN type) satisfy this condition, and we account for the observed mass-loss rates and inferred critical temperatures. We also show that there is no obvious momentum problem well below the photosphere. A less quantitative discussion is given for critical points with low to moderate optical depth, where non-LTE effects are conjectured to be crucial.

publication date

  • January 1, 1995