| CoRoT reveals a magnetic activity cycle in a Sun-like star. | |
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MedLine Citation:
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PMID: 20798310 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and mode amplitudes reveal a modulation of at least 120 days, with the minimum frequency shift corresponding to maximum amplitude as in the Sun. These observations are evidence of a stellar magnetic activity cycle taking place beneath the surface of HD49933 and provide constraints for stellar dynamo models under conditions different from those of the Sun. |
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Authors:
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Rafael A García; Savita Mathur; David Salabert; Jérôme Ballot; Clara Régulo; Travis S Metcalfe; Annie Baglin |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 329 ISSN: 1095-9203 ISO Abbreviation: Science Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-27 Completed Date: 2010-09-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
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Languages: eng Pagination: 1032 Citation Subset: - |
Affiliation:
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Laboratoire Astrophysique, Instrumentation, et Modélisation, CEA/Direction des Sciences de la Matière-CNRS, Université Paris 7 Diderot, Institut de Recherche sur les Lois Fondamentales de l'Univers/Service d'Astrophysique, Centre de Saclay, 91191 Gif-sur-Yvette, France. Rafael.Garcia@cea.fr |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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