Spectral analyses of Wolf-Rayet stars - Hydrogen abundances in WN subtypes

Details Spectral analyses of Wolf-Rayet stars - Hydrogen abundances in WN subtypes Spectral analyses of Wolf-Rayet stars - Hydrogen abundances in WN subtypes

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..443h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 443-454.

Astronomy and Astrophysics

Astrophysics

43

Hydrogen, Local Thermodynamic Equilibrium, Spectrum Analysis, Stellar Atmospheres, Wolf-Rayet Stars, Abundance, Massive Stars, Stellar Evolution, Stellar Temperature

Scientific paper

The spectra of four WN stars are analyzed quantitatively, focusing on the hydrogen abundances. The analyses are based on multilevel non-LTE models for expanding atmospheres composed of helium and hydrogen. The resulting hydrogen fraction is found to range from 10 to 40 percent by mass, which confirms that WN atmospheres exhibit material which has undergone nuclear burning. When the hydrogen detection is correlated with the stellar temperature a clear separation between two groups can be obtained, i.e., the cool stars with stellar temperature approximately equals 35 kK exhibit hydrogen, whereas the hot stars with stellar greater than 50 kK do not.

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