Talk detail

Participant	Torrejon, Jose
Institution	Universidad de Alicante - Carretera de San Vicente s/n - San Vicente del Raspeig - Alicante - Spain

Session	SO3	Accepted	Yes	Order	1	Time	14:00 - 14:20	20'
Talk	Oral abstract	Title	The Mystery of gamma Cas-type X-ray Sources
Co-authors
Abstract	Until recently gamma Cas stood alone as the major exception to our understanding of the X-ray emission from massive stars. In the last years, however, a growing number of 'gamma Cas-like' objects has been unveiled by X-ray telescopes suggesting the existence of an entire new class of X-ray sources. The nature of their X-ray emission remains a mistery. Two hypothesys have been put forward: accretion onto a degenerate companion (a White Dwarf) or, alternatively, the interaction of the circumstellar disk with the star's magnetic field. Both explanations challenge our current understanding of the structure and evolution of massive stars. In this talk, I will review the state of the field with special emphasis on the last discoveries.