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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160929T103000
DTEND;TZID=Atlantic/Canary:20160929T113000
UID:iactalks-953
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/953
CREATED:2016-09-29T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Magnetic Massive Stars
DESCRIPTION:Magnetic Massive Stars\nDr. Fabian Schneider\n\nApproximately 1
 0 per cent of massive OBA main-sequence (MS) and pre-MS stars harbour stro
 ng, large-scale magnetic fields. At the same time, there is a dearth of ma
 gnetic stars in close binaries. A process generating strong magnetic field
 s only in some stars must be responsible and several channels for the form
 ation of magnetic massive stars have been proposed. In this talk, I will p
 resent recent results on the origin and evolution of such strong surface m
 agnetic fields. Regarding the origin, mergers of MS and pre-MS stars have 
 been proposed to form magnetic stars and I will highlight a method to prob
 e this hypothesis observationally. Applying this new method to two magneti
 c massive stars, we find that they are indeed consistent with being MS mer
 ger products. Utilising a large sample of magnetic and non-magnetic OB sta
 rs, I will show that there is a dearth of evolved magnetic stars that sugg
 ests that magnetic fields disappear over time. I will argue that this is m
 ost likely caused by decaying magnetic fields.
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