Radio Detection of Colliding Wind Binaries

Four massive, early-type stars, three of which are confirmed binaries, have been observed with the Australia Telescope Compact Array at 1.4, 2.4, 4.8, and 8.6 GHz. The earliest star cataloged so far, HD 93129A, was also observed at 17.8 and 24.5 GHz. Here we present an analysis of the spectra as wel...

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Bibliographic Details
Published in:	Publications of the Astronomical Society of Australia Vol. 23; no. 1; pp. 50 - 63
Main Authors:	Benaglia, Paula, Koribalski, Bärbel, Colombo, Juan F. Albacete
Format:	Journal Article
Language:	English
Published:	Cambridge, UK Cambridge University Press 2006
Subjects:	Australia stars: early-type radio continuum: stars stars: winds, outflows stars: mass loss stars: individual (CD-47 4551, HD 93129A, HD 124314, HD 150136)
Online Access:	Get full text
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Summary:	Four massive, early-type stars, three of which are confirmed binaries, have been observed with the Australia Telescope Compact Array at 1.4, 2.4, 4.8, and 8.6 GHz. The earliest star cataloged so far, HD 93129A, was also observed at 17.8 and 24.5 GHz. Here we present an analysis of the spectra as well as the structure of the stellar systems. All four spectra show clear evidence of non-thermal emission, indicative of a binary system with a colliding wind region. We discuss the magnetic field of the emitting region of HD 93129A and make predictions on the radiation at high energies. Archive X-ray observations towards the target sources are also investigated and interpreted in the light of the non-thermal emission detected.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1323-3580 1448-6083
DOI:	10.1071/AS05039