Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis

Alecian, E. and Wade, G. A. and Catala, C. and Folsom, C. and Grunhut, J. and Donati, J. -F. and Petit, P. and Bagnulo, S. and Marsden, S. C. and Ramirez, J. and Landstreet, J. D. and Boehm, T. and Bouret, J. -C. and Silvester, J. (2008) Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis. In: Proceedings of the CP#AP Workshop 2007, 10-14 Sep 2007, Vienna, Austria.

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Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latter is the fossil field, which implies that the magnetic fields subsist throughout the different evolutionary phases, and in particular during the pre-main sequence phase. The existence of magnetic fields at the pre-main sequence phase is also required to explain the slow rotation of Ap/Bp stars. However, until recently, essentially no information was available about the magnetic properties of intermediate-mass pre-main sequence stars, the so-called Herbig Ae/Be stars. The new high-resolution spectropolarimeter ESPaDOnS, installed in 2005 at the Canada-France-Hawaii telescope, provided 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 8 Herbig Ae/Be stars, ranging in mass from 2 to nearly 15 solar masses. In this contribution we will present the results of our survey, as well as their implications for the origin and evolution of the magnetic fields and rotation.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 16 Oct 2014 04:37
Last Modified: 08 Dec 2014 07:25
Uncontrolled Keywords: Herbig; stars; magnetic fields; pre-main sequence; spectropolaximetry
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020107 Mesospheric, Ionospheric and Magnetospheric Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences

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