A grid of models for Wolf-Rayet stars of the carbon sequence (WC)

Details A grid of models for Wolf-Rayet stars of the carbon sequence (WC) A grid of models for Wolf-Rayet stars of the carbon sequence (WC)

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..535k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 2, p. 535-543.

Astronomy and Astrophysics

Astrophysics

20

Stellar Models, Wolf-Rayet Stars, Radiative Transfer, Spectral Line Width, Stellar Mass Ejection, Stellar Temperature

Scientific paper

A grid of models for Wolf-Rayet stars of the carbon sequence (WC) is presented. The calculations account for non-LTE radiation transfer in spherically expanding stellar atmospheres which are composed of helium and carbon. Both elements are represented by detailed model atoms, especially concerning the ions C III and C IV. The 2D grid with a fixed carbon abundance of beta(c) = 0.6 (mass-fraction) covers a wide range of stellar temperatures and radii. Although only one specific mass-loss rate of M = 10 exp -4 solar masses/yr is considered, the grid applies as well for stars with different M thanks to the transformation properties of WR atmospheres. Equivalent widths are presented for several observable lines in the form of contour plots. They show the dependence of line strengths on the stellar parameters, and thus provide the tools for coarse analyses of observed WC spectra. The application of the grid is demonstrated by analyzing the WC 5 star WR 111 as an example. The results are in fairly good agreement with detailed analyses.

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