Direct observation of magnetic cycles in Sun-like stars

Morgenthaler, A., Petit, P., Morin, J., Aurière, M., Dintrans, B., Konstantinova-Antova , R., and Marsden, S. (2011) Direct observation of magnetic cycles in Sun-like stars. Astronomische Nachrichten, 332 (9-10). pp. 866-871.

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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.

Item ID: 20757
Item Type: Article (Research - C1)
ISSN: 1521-3994
Keywords: stars: magnetic fields; stars: activity; stars: rotation; techniques: polarimetric
Date Deposited: 06 Mar 2012 23:47
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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