Stellar magnetic activity and variability of oscillation parameters: An investigation of 24 solar-like stars observed by Kepler

dc.bibliographicCitation.journalTitleAstronomy and Astrophysicseng
dc.bibliographicCitation.volume598
dc.contributor.authorKiefer, René
dc.contributor.authorSchad, Ariane
dc.contributor.authorDavies, Guy
dc.contributor.authorRoth, Markus
dc.date.accessioned2018-04-16T09:58:00Z
dc.date.available2019-06-28T12:39:37Z
dc.date.issued2017
dc.description.abstractContext. The Sun and solar-like stars undergo activity cycles for which the underlying mechanisms are not well understood. The oscillations of the Sun are known to vary with its activity cycle and these changes provide diagnostics on the conditions below the photosphere. Kepler has detected solar-like oscillations in hundreds of stars but as of yet, no widespread detection of signatures of magnetic activity cycles in the oscillation parameters of these stars have been reported. Aims. We analysed the photometric short cadence Kepler time series of a set of 24 solar-like stars, which were observed for at least 960 d each, with the aim to find signatures of stellar magnetic activity in the oscillation parameters. Methods. We analyse the temporal evolution of oscillation parameters by measuring mode frequency shifts, changes in the height of the p-mode envelope, as well as granulation timescales. Results. For 23 of the 24 investigated stars, we find significant frequency shifts in time. We present evidence for magnetic activity in six of these stars. We find that the amplitude of the frequency shifts decreases with stellar age and rotation period. For KIC 8006161 (the most prominent example), we find that frequency shifts are smallest for the lowest and largest for the highest p-mode frequencies, as they are for the Sun. Conclusions. These findings show that magnetic activity can be routinely observed in the oscillation parameters for solar-like stars, which opens up the possibility of placing the solar activity cycle in the context of other stars by asteroseismology.eng
dc.description.versionpublishedVersioneng
dc.formatapplication/pdf
dc.identifier.urihttps://doi.org/10.34657/1665
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/4316
dc.language.isoengeng
dc.publisherLes Ulis : EDP Scienceseng
dc.relation.doihttps://doi.org/10.1051/0004-6361/201628469
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subject.ddc530eng
dc.subject.otherasteroseismologyeng
dc.subject.otherstars: activityeng
dc.subject.otherstars: oscillationseng
dc.subject.otherstars: solar-typeeng
dc.subject.otherstars: magnetic fieldeng
dc.subject.othermethods: data analysiseng
dc.titleStellar magnetic activity and variability of oscillation parameters: An investigation of 24 solar-like stars observed by Keplereng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorKISeng
wgl.subjectPhysikeng
wgl.typeZeitschriftenartikeleng
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
aa28469-16.pdf
Size:
656.59 KB
Format:
Adobe Portable Document Format
Description:
Collections