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Dynamo-generated magnetic fields in fast rotating single giants

Published online by Cambridge University Press:  01 November 2008

Renada Konstantinova-Antova ,
Michel Aurière ,
Klaus-Peter Schröder  and
Pascal Petit
Renada Konstantinova-Antova
Affiliation:
Inst. of Astronomy, Bulgarian Acdy of Sciences, Sofia, 72 Tsarigradsko shosse, Bulgaria email: [email protected]
Michel Aurière
Affiliation:
Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, Observatoire Midi Pyrénés, 57 Avenue d'Azereix, 65008 Tarbes, France email: [email protected]
Klaus-Peter Schröder
Affiliation:
Departmento de Astronomia, Universidad de Guanajuato, GTO, Academic Street, Camford, CF3 5QL, Mexico email: [email protected]
Pascal Petit
Affiliation:
Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, Observatoire Midi Pyrénés, 57 Avenue d'Azereix, 65008 Tarbes, France email: [email protected]
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Abstract

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Red giants offer a good opportunity to study the interplay of magnetic fields and stellar evolution. Using the spectro-polarimeter NARVAL of the Telescope Bernard Lyot (TBL), Pic du Midi, France and the LSD technique we began a survey of magnetic fields in single G-K-M giants. Early results include 6 MF-detections with fast rotating giants, and for the first time a magnetic field was detected directly in an evolved M-giant: EK Boo. Our results could be explained in the terms of α–ω dynamo operating in these giants.

Keywords

Magnetic fields – stars: evolution – stars: late-type – stars: activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 433 - 434
Copyright
Copyright © International Astronomical Union 2009

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