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

hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorLÈBRE, Agnès
dc.contributor.authorAURIÈRE, Michel
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorFABAS, Nicolas
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
dc.contributor.authorGILLET, Denis
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorHERPIN, Fabrice
hal.structure.identifierCentre d'Economie de l'Université Paris Nord (ancienne affiliation) [CEPN]
dc.contributor.authorPETIT, Pascal
dc.contributor.authorKONSTANTINOVA-ANTOVA, Renada
dc.date.issued2014-08
dc.date.conference2013
dc.description.abstractEnSo 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.
dc.language.isoen
dc.source.titleMagnetic Fields throughout Stellar Evolution, Proceedings of the International Astronomical Union, , IAU Symposium, Volume 302, pp. 385-388 - 2014 - held 30 august 2013 - Biaritz - France -2014IAUS..302..385L
dc.subject.enStars: AGB and post-AGB
dc.subject.enstars: atmospheres
dc.subject.enMagnetic fields
dc.subject.enshock waves
dc.title.enSearch for surface magnetic fields in Mira stars: first results on χ Cyg
dc.typeCommunication dans un congrès
dc.identifier.doi10.1017/S1743921314002579
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
bordeaux.page385-388
bordeaux.volume302
bordeaux.conference.titleMagnetic Fields throughout Stellar Evolution
bordeaux.countryFR
bordeaux.title.proceedingMagnetic Fields throughout Stellar Evolution, Proceedings of the International Astronomical Union, , IAU Symposium, Volume 302, pp. 385-388 - 2014 - held 30 august 2013 - Biaritz - France -2014IAUS..302..385L
bordeaux.conference.cityBiarritz
bordeaux.peerReviewedoui
hal.identifierhal-01061808
hal.version1
hal.invitednon
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01061808v1
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