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Verification of the Kepler Input Catalog from Asteroseismology of Solar-type Stars

TitreVerification of the Kepler Input Catalog from Asteroseismology of Solar-type Stars
Type de publicationJournal Article
Year of Publication2011
AuteursVerner, GA, Chaplin, WJ, Basu, S, Brown, TM, Hekker, S, Huber, D, Karoff, C, Mathur, S, Metcalfe, TS, Mosser, B, Quirion, P-O, Appourchaux, T, Bedding, TR, Bruntt, H, Campante, TL, Elsworth, Y, Garcia, RA, Handberg, R, Regulo, C, Roxburgh, IW, Stello, D, Christensen-Dalsgaard, J, Gilliland, RL, Kawaler, SD, Kjeldsen, H, Allen, C, Clarke, BD, Girouard, FR
JournalThe Astrophysical Journal Letters
Date PublishedSeptember 1, 2011
Mots-clésstars: fundamental parameters, stars: interiors, stars: oscillations

We calculate precise stellar radii and surface gravities from the asteroseismic analysis of over 500 solar-type pulsating stars observed by the Kepler space telescope. These physical stellar properties are compared with those given in the Kepler Input Catalog (KIC), determined from ground-based multi-color photometry. For the stars in our sample, we find general agreement but we detect an average overestimation bias of 0.23 dex in the KIC determination of log (g) for stars with log (g)KIC> 4.0 dex, and a resultant underestimation bias of up to 50% in the KIC radii estimates for stars with R KIC< 2 R sun. Part of the difference may arise from selection bias in the asteroseismic sample; nevertheless, this result implies there may be fewer stars characterized in the KIC with R ~ 1 R sun than is suggested by the physical properties in the KIC. Furthermore, if the radius estimates are taken from the KIC for these affected stars and then used to calculate the size of transiting planets, a similar underestimation bias may be applied to the planetary radii.

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