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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Solar-like oscillations in red giants observed with Kepler: Comparison of global oscillation parameters from different methods
Astronomy and Astrophysics, Volume 525, No. 8, Article A131, Year 2010
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Description
Context. The large number of stars for which uninterrupted high-precision photometric timeseries data are being collected with 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 (νmax) and the mean large separation (Δν) 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 νmax and Δν due to differences in realization noise are not negligible and should be taken into account when using these results for stellar modelling. © 2010 ESO.
Authors & Co-Authors
Hekker, Saskia
United Kingdom, Birmingham
University of Birmingham
Elsworth, Y.
United Kingdom, Birmingham
University of Birmingham
de Ridder, Joris
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Mosser, B.
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
García, Raphael A.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Kallinger, Thomas
Canada, Vancouver
The University of British Columbia
Austria, Vienna
Universität Wien
Mathur, Savita
United States, Boulder
The Earth and Sun Systems Laboratory
Huber, Daniel F.
Australia, Sydney
The University of Sydney
Buzasi, Derek L.
United States, Oakland
Eureka Scientific, Inc.
Preston, H. L.
United States, Oakland
Eureka Scientific, Inc.
South Africa, Pretoria
University of South Africa
Hale, S. J.
United Kingdom, Birmingham
University of Birmingham
Ballot, J.
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
Chaplin, W. J.
United Kingdom, Birmingham
University of Birmingham
Régulo, Clara
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Bedding, Timothy R.
Australia, Sydney
The University of Sydney
Stello, Dennis
Australia, Sydney
The University of Sydney
Borucki, William J.
United States, Moffett Field
Nasa Ames Research Center
Koch, David G.
United States, Moffett Field
Nasa Ames Research Center
Jenkins, Jon M.
United States, Moffett Field
Nasa Ames Research Center
Allen, Christopher
United States, Moffett Field
Nasa Ames Research Center
Gilliland, Ronald L.
United States, Baltimore
Space Telescope Science Institute
Kjeldsen, Henrik
Denmark, Aarhus
Aarhus Universitet
Christensen-Dalsgaard, Joergen
Denmark, Aarhus
Aarhus Universitet
Statistics
Citations: 23
Authors: 23
Affiliations: 16
Identifiers
ISSN:
00046361
e-ISSN:
14320746