Mass loss rate determinations of southern OB stars

Details Mass loss rate determinations of southern OB stars Mass loss rate determinations of southern OB stars

2001-05-03

arxiv.org/abs/astro-ph/0105056v1

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20010617

A sample of OB stars (eleven Of, one O and one B supergiant) has been surveyed with the Australia Telescope Compact Array at 4.8 and 8.64 GHz with a resolution of 2'' -- 4''. Five stars were detected; three of them have negative spectral indices, consistent with non-thermal emission, and two have positive indices. The thermal radiation from HD 150135 and HD 163181 can be explained as coming from an optically thick ionized stellar wind. The non-thermal radiation from CD-47 4551, HD 124314 and HD 150136 possibly comes from strong shocks in the wind itself and/or in the wind colliding region if the stars have a massive early-type companion. The percentage of non-thermal emitters among detected O stars has increased up to ~50%. The Of star HD 124314 clearly shows flux density variations. Mass loss rates (or upper limits) were derived for all the observed stars and the results compared with non-radio measurements and theoretical predictions.

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