Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819

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dc.creator Gruberbauer, Michael
dc.creator Basu, Sarbani
dc.creator Grundahl, Frank
dc.creator Stello, Dennis
dc.creator Kallinger, T.
dc.creator Hekker, Saskia
dc.creator Mosser, Benoit
dc.creator Garcia, Rafael A.
dc.creator Mathur, Savita
dc.creator Brogaard, Karsten
dc.date.accessioned 2014-11-03T15:57:19Z
dc.date.available 2014-11-03T15:57:19Z
dc.date.issued 2011-03-01
dc.identifier.issn 2041-8205
dc.identifier.issn 2041-8213
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/25899
dc.description Publisher's version/PDF en_CA
dc.description.abstract We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA’s Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC 6791 is (m − M)[subscript 0] = 13.11 [plus or minus] 0.06. We find (m − M)[subscript 0] = 11.85 [plus or minus] 0.05 for NGC 6819. The average mass of stars on the RGB of NGC 6791 is 1.20 [plus or minus] 0.01 M [subscript circled dot], while that of NGC 6819 is 1.68 [plus or minus] 0.03 M[subscript circled dot] . It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC 6791, however, most sets of models give ages around 7 Gyr. We obtain ages between 2 and 2.4 Gyr for NGC 6819. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1088/2041-8205/729/1/L10
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 Stars -- Open clusters
dc.subject.lcsh Stellar oscillations
dc.subject.lcsh Astroseismology
dc.title Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal Letters 729, L10. (2011) en_CA


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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/10.1088/2041-8205/729/1/L10
 
 

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