Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318..402h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 2, pp. 402-410.
Astronomy and Astrophysics
Astronomy
27
Binaries: Close, Stars: Individual: Wr 42, Stars: Individual: Wr 79, Stars: Mass-Loss, Stars: Wolf-Rayet
Scientific paper
We have obtained complete phase coverage of the WC7+O binaries WR 42=HD 97152 and WR 79=HD 152270 with high signal-to-noise ratio (S/N), moderate-resolution spectra. Remarkable orbital phase-locked profile variations of the Ciii λ5696 line are observed and interpreted as arising from colliding wind effects. Within this scenario, we have modelled the spectra using a purely geometrical model that assumes a cone-shaped wind-wind interaction region which partially wraps around the O star. Such modelling holds the exciting promise of revealing a number of interesting parameters for WR+O binaries, such as the orbital inclination, the streaming velocity of material in the interaction region and the ratio of wind momentum flux. Knowledge of these parameters in turn leads to the possibility of a better understanding of WR star masses, mass-loss rates and wind region characteristics.
Bartzakos Peter
Hill Grant Michael
Moffat Anthony F. J.
St-Louis Nicole
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