Bibcode
Campante, T. L.; Handberg, R.; Mathur, S.; Appourchaux, T.; Bedding, T. R.; Chaplin, W. J.; García, R. A.; Mosser, B.; Benomar, O.; Bonanno, A.; Corsaro, E.; Fletcher, S. T.; Gaulme, P.; Hekker, S.; Karoff, C.; Régulo, C.; Salabert, D.; Verner, G. A.; White, T. R.; Houdek, G.; Brandão, I. M.; Creevey, O. L.; Doǧan, G.; Bazot, M.; Christensen-Dalsgaard, J.; Cunha, M. S.; Elsworth, Y.; Huber, D.; Kjeldsen, H.; Lundkvist, M.; Molenda-Żakowicz, J.; Monteiro, M. J. P. F. G.; Stello, D.; Clarke, B. D.; Girouard, F. R.; Hall, J. R.
Bibliographical reference
Astronomy and Astrophysics, Volume 534, id.A6
Advertised on:
10
2011
Journal
Citations
77
Refereed citations
61
Description
Context. The evolved main-sequence Sun-like stars KIC 10273246 (F-type)
and KIC 10920273 (G-type) were observed with the NASA Kepler satellite
for approximately ten months with a duty cycle in excess of 90%. Such
continuous and long observations are unprecedented for solar-type stars
other than the Sun. Aims: We aimed mainly at extracting estimates
of p-mode frequencies - as well as of other individual mode parameters -
from the power spectra of the light curves of both stars, thus providing
scope for a full seismic characterization. Methods: The light
curves were corrected for instrumental effects in a manner independent
of the Kepler science pipeline. Estimation of individual mode parameters
was based both on the maximization of the likelihood of a model
describing the power spectrum and on a classic prewhitening method.
Finally, we employed a procedure for selecting frequency lists to be
used in stellar modeling. Results: A total of 30 and 21 modes of
degree l = 0,1,2 - spanning at least eight radial orders - have been
identified for KIC 10273246 and KIC 10920273, respectively. Two avoided
crossings (l = 1 ridge) have been identified for KIC 10273246, whereas
one avoided crossing plus another likely one have been identified for
KIC 10920273. Good agreement is found between observed and predicted
mode amplitudes for the F-type star KIC 10273246, based on a revised
scaling relation. Estimates are given of the rotational periods, the
parameters describing stellar granulation and the global asteroseismic
parameters Δν and νmax.
Related projects
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Savita
Mathur