Evelyn Alecian, France ()
"Magnetism and rotation in the young Herbig Ae/Be stars"
Abstract. Today, one of the greatest challenges concerning stellar physics, is to understand the origin and the impact of magnetic fields on stellar structure and evolution. Around 5% of the main sequence (MS) intermediate mass stars (A/B stars) show strong and large-scale magnetic fields stable over many years, suggesting a fossil origin for these magnetic fields.However, until recently, essentially no information was available about the magnetic properties of their pre-main sequence progenitors, the Herbig Ae/Be stars. The new high-resolution spectropolarimeter ESPaDOnS, installed in 2005 at the Canada-France-Hawaii telescope, provided for the first time the capability necessary to perform surveys of the Herbig Ae/Be stars in order to investigate their magnetism and rotation. These investigations have resulted in the detection and/or confirmation of magnetic fields in 7 Herbig Ae/Be stars, ranging in mass from 1.5 to nearly 15 solar masses. In this talk I will present the results of our survey, as well as their implications for the origin and evolution of the magnetic fields and rotation at intermediate masses.
Held in the AAO Conference room at 03:30 PM on Friday, 09 April 2010back