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Rechercher

OSUG - Terre Univers Environnement OSUG

Séminaire du Jeudi 23 Octobre 2014

Magnetic O-type stars in the Galaxy and beyond

Gregg Wade (RMC) Thursday October 23rd - 11am IPAG Seminar Room - IPAG

Since 2002, strong, organized magnetic fields have been firmly detected at the surfaces of about 10 Galactic O-type stars. In this talk I will review the characteristics of the inferred fields of individual stars, as well as the overall population. I will discuss the extension of the “magnetic desert”, first inferred among the A-type stars, to O stars up to 60 solar masses. I will discuss the interaction of the winds of the magnetic stars with the fields above their surfaces, generating complex “dynamical magnetospheric” structures detected in optical and UV lines, and in X-ray lines and continuum. Finally, I will discuss the detection of a small number of variable O stars in the LMC and SMC that exhibit spectral characteristics analogous to the known Galactic magnetic stars, and that almost certainly represent the first known examples of extragalactic magnetic stars.


Sous la tutelle de:

tutelles

Sous la tutelle de:

CNRS Université Grenoble Alpes