Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-19
Astronomy and Astrophysics
Astrophysics
To appear in Proceedings IAU Symposium No. 259, 2009. Cosmic Magnetic Fields: From Planets, to Stars and Galaxies
Scientific paper
10.1017/S1743921309031081
It is now well-known that the surface magnetic fields observed in cool, lower-mass stars on the main sequence (MS) are generated by dynamos operating in their convective envelopes. However, higher-mass stars (above 1.5 Msun) pass their MS lives with a small convective core and a largely radiative envelope. Remarkably, notwithstanding the absence of energetically-important envelope convection, we observe very strong (from 300 G to 30 kG) and organised (mainly dipolar) magnetic fields in a few percent of the A and B-type stars on the MS, the origin of which is not well understood. In this poster we propose that these magnetic fields could be of fossil origin, and we present very strong observational results in favour of this proposal.
Alecian Evelyne
Catala Claude
Wade Gregg A.
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