Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler

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dc.creator Appourchaux, T.
dc.creator Benomar, O.
dc.creator Gruberbauer, Michael
dc.creator Chaplin, W. J.
dc.creator Garcia, R. A.
dc.creator Handberg, R.
dc.creator Verner, G. A.
dc.creator Antia, H. M.
dc.creator Campante, T. L.
dc.creator Davies, G. R.
dc.date.accessioned 2013-11-06T20:01:49Z
dc.date.available 2013-11-06T20:01:49Z
dc.date.issued 2012-01
dc.identifier.issn 0004-6361
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/25347
dc.description Publisher's version/PDF
dc.description.abstract Context. Solar-like oscillations have been observed by Kepler and CoRoT in several solar-type stars. Aims. We study the variations in the stellar p-mode linewidth as a function of effective temperature. Methods. We study a time series of nine months of Kepler data. We analyse the power spectra of 42 cool main-sequence stars and subgiants using both maximum likelihood estimators and Bayesian estimators to recover individual mode characteristics such as frequencies, linewidths, and mode heights. Results. We report on the mode linewidth at both maximum power and maximum mode height for these 42 stars as a function of effective temperature. Conclusions. We show that the mode linewidth at either maximum mode height or maximum amplitude follows a scaling relation with effective temperature, which is a combination of a power law and a lower bound. The typical power-law index is about 13 for the linewidth derived from the maximum mode height, and about 16 for the linewidth derived from the maximum amplitude, while the lower bound is about 0.3 [mu]Hz and 0.7 [mu]Hz, respectively. We stress that this scaling relation is only valid for cool main-sequence stars and subgiants, and does not have any predictive power outside the temperature range of these stars. en_CA
dc.language.iso en en_CA
dc.publisher EDP Sciences en_CA
dc.relation.uri http://dx.doi.org/10.1051/0004-6361/201118496
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Astroseismology
dc.subject.lcsh Stellar oscillations
dc.title Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomy & Astrophysics 537, A134. (2012)


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1051/0004-6361/201118496
 
 

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