Direct observation of magnetic cycles in Sun‐like stars
Identifieur interne : 000480 ( Istex/Corpus ); précédent : 000479; suivant : 000481Direct observation of magnetic cycles in Sun‐like stars
Auteurs : A. Morgenthaler ; P. Petit ; J. Morin ; M. Aurière ; B. Dintrans ; R. Konstantinova-Antova ; S. MarsdenSource :
- Astronomische Nachrichten [ 0004-6337 ] ; 2011-12.
English descriptors
- KwdEn :
- Chromospheric, Chromospheric activity, Chromospheric emission, Collier cameron, Cool stars, Cycle lengths, Data reduction, Data sets, Different types, Direct observation, Donati, Gmbh, Instrumental setup, Kgaa, Magnetic activity, Magnetic cycles, Magnetic geometry, Magnetic maps, Magnetic variability, Magnetic vector, Mnras, Narval, Narval spectropolarimeter, Online colour, Polarity reversals, Polarity switches, Radial velocity, Representative examples, Reversal, Rotation period, Rotation periods, Rotational modulation, Stellar, Stellar masses, Stellar sample, Temporal evolution, Variability, Verlag, Verlag gmbh, Weinheim, Wide range, Zeeman signatures.
- Teeft :
- Chromospheric, Chromospheric activity, Chromospheric emission, Collier cameron, Cool stars, Cycle lengths, Data reduction, Data sets, Different types, Direct observation, Donati, Gmbh, Instrumental setup, Kgaa, Magnetic activity, Magnetic cycles, Magnetic geometry, Magnetic maps, Magnetic variability, Magnetic vector, Mnras, Narval, Narval spectropolarimeter, Online colour, Polarity reversals, Polarity switches, Radial velocity, Representative examples, Reversal, Rotation period, Rotation periods, Rotational modulation, Stellar, Stellar masses, Stellar sample, Temporal evolution, Variability, Verlag, Verlag gmbh, Weinheim, Wide range, Zeeman signatures.
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:
DOI: 10.1002/asna.201111592
Links to Exploration step
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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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