Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..561v&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)561-(12)572
Astronomy and Astrophysics
Astronomy
Binary Stars, Infrared Astronomy, Infrared Sources (Astronomy), O Stars, Radio Astronomy, Radio Emission, Stellar Winds, Wolf-Rayet Stars, X Ray Astronomy, X Ray Sources, Exosat Satellite, Ginga Satellite, Heao 2, Light Curve, Very Large Array (Vla), Very Long Base Interferometry
Scientific paper
We discuss the incidence of Wolf-Rayet stars with variable non-thermal radio emission, excess X-ray fluxes, and episodic/periodic IR excesses. Two stars, WR140 and WR125, show all three phenomena, eleven show at least one of those phenomena. In WR140 (WC7+O4-5, P = 7.49 yr) we observe with very long base interferometry (VLBI) its non-thermal 6 cm radio emission from a localized area of 11% of the size of the 6 cm free-free radio photosphere. We associate the non-thermal radio emisssion with the colliding winds of WR and O stars in WR140. Generalizing the case of WR140, we argue that all thirteen objects are long-period WR+OB or WR+c binaries with orbit sizes of the order of magnitude of the sizes of the radio photospheres of the WR components or larger, where the non-thermal radio emission is associated with their colliding winds.
van der Hucht Karel A.
Williams Peredur M.
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