Volume 372, Number 3, June IV 2001
|Page(s)||952 - 962|
|Section||Interstellar and circumstellar matter|
|Published online||15 June 2001|
Mass loss rate determination of southern OB stars
Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
2 Fac. de Cs. Astronómicas y Geofísicas, La Plata National University, Paseo del Bosque S/N, (1900) La Plata, Argentina
3 Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
Corresponding author: P. Benaglia, firstname.lastname@example.org
Accepted: 23 April 2001
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.
Key words: stars: early-type / stars: mass loss / stars: winds, outflows / radio continuum: stars
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.