Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.109..249n&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 109, no. 2, Feb. 1985, p. 249-257. Research supported by the Deutsche Fors
Astronomy and Astrophysics
Astrophysics
2
Binary Stars, O Stars, Stellar Envelopes, Wolf-Rayet Stars, Radial Velocity, Stellar Models, Stellar Spectra, Stellar Winds
Scientific paper
HD 152270 is a binary system containing an O5 star and a Wolf-Rayet companion of spectral type WC 6-7. The prominent spectral features are emission lines of ionized helium and carbon which are generated in an expanding shell surrounding both stars. One of these - the C III line at 5696 A - is of great interest because it is optically thin and not severely blended. Two simple descriptions for the envelope are developed. The validity of one of them, called the cone model, is discussed. The other one, the two-center approximation, will be studied in a forthcoming article (Neutsch and Schmidt, 1985). The cone model, is compared with a more physical one which is based on a Monte-Carlo simulation of the stellar-wind flow and is believed to be a much better approximation to reality. Furthermore, it is possible to test the assumptions of the cone model by quantitatively reducing spectral observations of HD 152270.
Neutsch Wolfram
Schmidt Harry
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