Solar-like oscillations in red giants observed with Kepler: Comparison of global oscillation parameters from different methods

The large number of stars for which uninterrupted high-precision photometric timeseries data are being collected with textit{Kepler} and CoRoT initiated the development of automated methods to analyse the stochastically excited oscillations in main-sequence, subgiant and red-giant stars. Aims: We investigate the differences in results for global oscillation parameters of G and K red-giant stars due to different methods and definitions. We also investigate uncertainties originating from the stochastic nature of the oscillations. Methods: For this investigation we use Kepler data obtained during the first four months of operation. These data have been analysed by different groups using already published methods and the results are compared. We also performed simulations to investigate the uncertainty on the resulting parameters due to different realizations of the stochastic signal. Results: We obtain results for the frequency of maximum oscillation power (nu_max) and the mean large separation () from different methods for over one thousand red-giant stars. The results for these parameters agree within a few percent and seem therefore robust to the different analysis methods and definitions used here. The uncertainties for nu_max and due to differences in realization noise are not negligible and should be taken into account when using these results for stellar modelling.

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An edited version of this paper was published by EDP Sciences. Copyright 2010 The European Southern Observatory
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Author Hekker, S.
Elsworth, Y.
De Ridder, J.
Mosser, B.
Garcia, R.
Kallinger, T.
Mathur, Savita
Huber, D.
Buzasi, D.
Preston, H.
Hale, S.
Ballot, J.
Chaplin, W.
Regulo, C.
Bedding, T.
Stello, D.
Borucki, W.
Kock, D.
Jenkins, J.
Allen, C.
Gilliland, R.
Kjeldsen, H.
Christensen-Dalsgaard, J.
Publisher UCAR/NCAR - Library
Publication Date 2011-01-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-12-26T13:40:45.803996
Metadata Record Identifier edu.ucar.opensky::articles:10410
Metadata Language eng; USA
Suggested Citation Hekker, S., Elsworth, Y., De Ridder, J., Mosser, B., Garcia, R., Kallinger, T., Mathur, Savita, Huber, D., Buzasi, D., Preston, H., Hale, S., Ballot, J., Chaplin, W., Regulo, C., Bedding, T., Stello, D., Borucki, W., Kock, D., Jenkins, J., Allen, C., Gilliland, R., Kjeldsen, H., Christensen-Dalsgaard, J.. (2011). Solar-like oscillations in red giants observed with Kepler: Comparison of global oscillation parameters from different methods. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7np24w0. Accessed 31 January 2026.

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