- Radio observations of candidate magnetic O stars
- Astronomical Society of the Pacific conference series
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
A number of O stars are suspected to have (weak) magnetic fields because of the observed cyclical variability in their UV wind-lines. However, direct detections of these magnetic fields with optical spectropolarimetry have proven to be very difficult. We have searched for non-thermal radio emission, which would be a strong indication for the presence of a magnetic field. Of our 5 selected candidate magnetic O stars, 3 are detected: xi Per, which we find to have a non-thermal spectrum, and lambda Cep and alpha Cam which show a thermal spectrum. We also find that the fluxes are lower than the expected free-free (thermal) contribution of the stellar wind. This is in agreement with recent findings that the mass-loss rates from O stars using Halpha are overestimated because of clumping in the inner part of the stellar wind.
- Proceedings title: Mass loss from stars and the evolution of stellar clusters: Proceedings of a workshop held at Lunteren,
the Netherlands, 29 May-1 June 2006
Publisher: Astronomical Society of the Pacific (ASP)
Place of publication: San Francisco, CA
Editors: A. de Koter, L.J. Smith, L.B.F.M. Waters
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.