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Search for surface magnetic fields in Mira stars: first results on χ Cyg

Published online by Cambridge University Press:  07 August 2014

Agnès Lèbre ,
Michel Aurière ,
Nicolas Fabas ,
Denis Gillet ,
Fabrice Herpin ,
Pascal Petit  and
Renada Konstantinova-Antova
Agnès Lèbre
Affiliation:
Laboratoire Univers et Particules de Montpellier, CNRS & Université de Montpellier, France email: Agnes.Lebre@univ-montp2.fr
Michel Aurière
Affiliation:
IRAP, CNRS & Université de Toulouse, Observatoire Midi-Pyrénées, Toulouse, France
Nicolas Fabas
Affiliation:
Instituto de Astrofísica de Canarias & Universidad de la Laguna, Tenerife, Spain
Denis Gillet
Affiliation:
Observatoire de Haute Provence, OSU Pythéas, CNRS & Aix-Marseille Université, France
Fabrice Herpin
Affiliation:
Laboratoire d'Astronomie de Bordeaux, OASU, CNRS & Université de Bordeaux, France
Pascal Petit
Affiliation:
IRAP, CNRS & Université de Toulouse, Observatoire Midi-Pyrénées, Toulouse, France
Renada Konstantinova-Antova
Affiliation:
Institute of Astronomy and NAO, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Abstract

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So far, surface magnetic fields have never been reported on Mira stars, while observational facilities allowing detection and measurement of weak surface fields through the Zeeman effect have become available. Then, in order to complete the knowledge of the magnetic field and of its influence during the transition from Asymptotic Giant Branch (AGB) to Planetary Nebulae (PN) stages, we have undertaken a search for magnetic fields at the surface of Miras. We present the first spectropolarimetric observations (performed with the Narval instrument at Télescope Bernard Lyot-TBL, Pic du Midi, France) of the S-type Mira star χ Cyg. We have detected a polarimetric signal in the Stokes V spectra and we have established its Zeeman origin. We claim that it is likely to be related to a weak magnetic field present at the photospheric level and in the lower part of the stellar atmosphere. The origin of this magnetic field is discussed in the framework of shock waves periodically propagating throughout the atmosphere of a Mira.

Keywords

Stars: AGB and post-AGBstars: atmospheresMagnetic fieldsshock waves
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 385 - 388
Copyright
Copyright © International Astronomical Union 2014 

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