AustralieFrV1, Main, Exploration, bibRecord, 006452

Direct observation of magnetic cycles in Sun‐like stars

Identifieur interne : 006452 ( Main/Exploration ); précédent : 006451; suivant : 006453

Direct observation of magnetic cycles in Sun‐like stars

Auteurs : A. Morgenthaler [France] ; P. Petit [France] ; J. Morin [Irlande (pays)] ; M. Aurière [France] ; B. Dintrans [France] ; R. Konstantinova-Antova [Bulgarie] ; S. Marsden [Australie]

Source :

Astronomische Nachrichten [ 0004-6337 ] ; 2011-12.

RBID : ISTEX:1908BA3C88460D395B98E5EAB0B43CD6ED563BA2

English descriptors

Abstract

A sample of 19 solar‐type stars, probing masses between 0.6 and 1.4 solar masses and rotation periods between 3.4 and 43 days, was regularly observed using the NARVAL spectropolarimeter at Telescope Bernard Lyot (Pic du Midi, France) between 2007 and 2011. The Zeeman‐Doppler Imaging technique is employed to reconstruct the large‐scale photospheric magnetic field structure of the targets and investigate its long‐term temporal evolution. We present here the first results of this project with the observation of short magnetic cycles in several stars, showing up a succession of polarity reversals over the timespan of our monitoring. Preliminary trends suggest that short cycles are more frequent for stellar periods below a dozen days and for stellar masses above about one solar mass. The cycles lengths unveiled by the direct tracking of polarity switches are significantly shorter than those derived from previous studies based on chromospheric activity monitoring, suggesting the coexistence of several magnetic timescales in a same star (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Url:

https://api.istex.fr/document/1908BA3C88460D395B98E5EAB0B43CD6ED563BA2/fulltext/pdf

DOI: 10.1002/asna.201111592

Affiliations:

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Le document en format XML

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<term>Mnras</term>
<term>Narval</term>
<term>Narval spectropolarimeter</term>
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<front><div type="abstract" xml:lang="en">A sample of 19 solar‐type stars, probing masses between 0.6 and 1.4 solar masses and rotation periods between 3.4 and 43 days, was regularly observed using the NARVAL spectropolarimeter at Telescope Bernard Lyot (Pic du Midi, France) between 2007 and 2011. The Zeeman‐Doppler Imaging technique is employed to reconstruct the large‐scale photospheric magnetic field structure of the targets and investigate its long‐term temporal evolution. We present here the first results of this project with the observation of short magnetic cycles in several stars, showing up a succession of polarity reversals over the timespan of our monitoring. Preliminary trends suggest that short cycles are more frequent for stellar periods below a dozen days and for stellar masses above about one solar mass. The cycles lengths unveiled by the direct tracking of polarity switches are significantly shorter than those derived from previous studies based on chromospheric activity monitoring, suggesting the coexistence of several magnetic timescales in a same star (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)</div>
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Direct observation of magnetic cycles in Sun‐like stars

Direct observation of magnetic cycles in Sun‐like stars

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri