Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rmxac...5...47w&link_type=abstract
Workshop on Colliding Winds in Binary Stars to Honor Jorge Sahade, vol. 5, p. 47
Astronomy and Astrophysics
Astronomy
6
Dust, Star Formation, Wolf-Rayet Stars, Binary Stars, Infrared Astronomy, Spectroscopy, Prototypes, A Stars, Binary Data
Scientific paper
It is evident from infrared observations made over the last two decades that there is a group of Wolf-Rayet stars which make dust episodically in their winds. In cases where observations have continued for long enough, it is seen that dust-formation episodes occur repeatedly, at intervals of about a decade. Three such episodes by the prototype, WR 140, have been observed and linked to the interaction of the winds of the WC7 and O4-5 components of this binary. A second episode by another system containing a WC7 star, WR 137, has recently begun. New optical spectroscopy of two other WC systems, not previously known to be binaries and which have showed dust-formation episodes, indicates the presence of OB companions and suggests that they too might be binaries. Closely related to these systems is the long-period WC9+B0I binary WR 70, whose dust emission is more complex. These systems can give new insights to the structure of Wolf-Rayet winds.
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