Direct observation of magnetic cycles in Sun-like stars
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 emp...
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ftjamescook:oai:researchonline.jcu.edu.au:20757 2024-02-11T10:09:32+01:00 Direct observation of magnetic cycles in Sun-like stars Morgenthaler, A. Petit, P. Morin, J. Aurière, M. Dintrans, B. Konstantinova-Antova , R. Marsden, S. 2011-12 application/pdf https://researchonline.jcu.edu.au/20757/1/Marsden_1.pdf unknown Wiley-Blackwell http://dx.doi.org/10.1002/asna.201111592 https://researchonline.jcu.edu.au/20757/ https://researchonline.jcu.edu.au/20757/1/Marsden_1.pdf 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. restricted Article PeerReviewed 2011 ftjamescook https://doi.org/10.1002/asna.201111592 2024-01-22T23:28:22Z 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. Article in Journal/Newspaper narval narval James Cook University, Australia: ResearchOnline@JCU Astronomische Nachrichten 332 9-10 866 871 |
institution |
Open Polar |
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James Cook University, Australia: ResearchOnline@JCU |
op_collection_id |
ftjamescook |
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unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Morgenthaler, A. Petit, P. Morin, J. Aurière, M. Dintrans, B. Konstantinova-Antova , R. Marsden, S. |
spellingShingle |
Morgenthaler, A. Petit, P. Morin, J. Aurière, M. Dintrans, B. Konstantinova-Antova , R. Marsden, S. Direct observation of magnetic cycles in Sun-like stars |
author_facet |
Morgenthaler, A. Petit, P. Morin, J. Aurière, M. Dintrans, B. Konstantinova-Antova , R. Marsden, S. |
author_sort |
Morgenthaler, A. |
title |
Direct observation of magnetic cycles in Sun-like stars |
title_short |
Direct observation of magnetic cycles in Sun-like stars |
title_full |
Direct observation of magnetic cycles in Sun-like stars |
title_fullStr |
Direct observation of magnetic cycles in Sun-like stars |
title_full_unstemmed |
Direct observation of magnetic cycles in Sun-like stars |
title_sort |
direct observation of magnetic cycles in sun-like stars |
publisher |
Wiley-Blackwell |
publishDate |
2011 |
url |
https://researchonline.jcu.edu.au/20757/1/Marsden_1.pdf |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
http://dx.doi.org/10.1002/asna.201111592 https://researchonline.jcu.edu.au/20757/ https://researchonline.jcu.edu.au/20757/1/Marsden_1.pdf 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. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1002/asna.201111592 |
container_title |
Astronomische Nachrichten |
container_volume |
332 |
container_issue |
9-10 |
container_start_page |
866 |
op_container_end_page |
871 |
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1790609468969451520 |