Solar-like oscillations in low-luminosity red giants: first results from Kepler

Show simple item record

dc.creator Gruberbauer, Michael
dc.creator Bedding, T. R.
dc.creator Huber, D.
dc.creator Stello, D.
dc.creator Elsworth, Y. P.
dc.creator Hekker, S.
dc.creator Kallinger, T.
dc.creator Mathur, S.
dc.creator Mosser, B.
dc.creator Preston, H. L.
dc.date.accessioned 2014-11-03T15:29:11Z
dc.date.available 2014-11-03T15:29:11Z
dc.date.issued 2010-04-20
dc.identifier.issn 2041-8205
dc.identifier.issn 2041-8213
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/25898
dc.description Publisher's version/PDF en_CA
dc.description.abstract We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute sampling, reveal clear oscillations in a large sample of G and K giants, extending in luminosity from the red clump down to the bottom of the giant branch. We confirm a strong correlation between the large separation of the oscillations ([Delta]ν) and the frequency of maximum power (ν[subscript max]). We focus on a sample of 50 low-luminosity stars (ν[subscript max] [is greater than] 100 [micro]Hz, L [less than or similar to] 30 L[subscript circled dot] ) having high signal-to-noise ratios and showing the unambiguous signature of solar-like oscillations. These are H-shell-burning stars, whose oscillations should be valuable for testing models of stellar evolution and for constraining the star formation rate in the local disk. We use a new technique to compare stars on a single echelle diagram by scaling their frequencies and find well-defined ridges corresponding to radial and non-radial oscillations, including clear evidence for modes with angular degree l = 3. Measuring the small separation between l = 0 and l = 2 allows us to plot the so-called C-D diagram of [delta]ν[subscript 02] versus [Delta]ν. The small separation [delta]ν[subscript 01] of l = 1 from the midpoint of adjacent l = 0 modes is negative, contrary to the Sun and solar-type stars. The ridge for l = 1 is notably broadened, which we attribute to mixed modes, confirming theoretical predictions for low-luminosity giants. Overall, the results demonstrate the tremendous potential of Kepler data for asteroseismology of red giants. en_CA
dc.description.provenance Submitted by Janine Mills (janine.mills@smu.ca) on 2014-11-03T15:29:11Z No. of bitstreams: 1 Gruberbauer_Michael_article_2010_a.pdf: 477359 bytes, checksum: 8a5e821a241b98bf03a6db5c61e1dc6f (MD5) en
dc.description.provenance Made available in DSpace on 2014-11-03T15:29:11Z (GMT). No. of bitstreams: 1 Gruberbauer_Michael_article_2010_a.pdf: 477359 bytes, checksum: 8a5e821a241b98bf03a6db5c61e1dc6f (MD5) Previous issue date: 2010-04-20 en
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1088/2041-8205/713/2/L176
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 Red giants
dc.subject.lcsh Stellar oscillations
dc.title Solar-like oscillations in low-luminosity red giants: first results from Kepler en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal Letters 713, L176-L181. (2010) en_CA
 Find Full text

Files in this item


 

Copyright statement:

 
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/10.1088/2041-8205/713/2/L176
 
 

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Browse

My Account