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Radio Detection of Colliding Wind Binaries

Published online by Cambridge University Press:  05 March 2013

Paula Benaglia ,
Bärbel Koribalski  and
Juan F. Albacete Colombo
Paula Benaglia*
Affiliation:
Instituto Argentino de Radioastronomía, C.C. 5, Villa Elisa (1894), Argentina Facultad de Ciencias Astronómicas y Geofísicas, UNLP, 1900 La Plata, Argentina
Bärbel Koribalski
Affiliation:
Australia Telescope National Facility, CSIRO, Epping NSW 1710, Australia
Juan F. Albacete Colombo
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas, UNLP, 1900 La Plata, Argentina Osservatorio Astronomico di Palermo, 90134 Palermo, Italy
*
ECorresponding author. Email: pbenaglia@fcaglp.unlp.edu.ar
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Abstract

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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.

Keywords

stars: early-typestars: individual (CD-47 4551, HD 93129A, HD 124314, HD 150136)stars: mass lossstars: winds, outflowsradio continuum: stars
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 23 , Issue 1 , 2006 , pp. 50 - 63
Copyright
Copyright © Astronomical Society of Australia 2006

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