Solar-like oscillations in red giants observed with Kepler: comparison of global oscillation parameters from different methods
- Autor(en)
- S. Hekker, Y. Elsworth, J. De Ridder, B. Mosser, R. A. García, T. Kallinger, S. Mathur, D. Huber, D. L. Buzasi, H. L. Preston, S. J. Hale, J. Ballot, W. J. Chaplin, C. Régulo, T. R. Bedding, D. Stello, W. J. Borucki, D. G. Koch, J. Jenkins, C. Allen, R. L. Gilliland, H. Kjeldsen, J. Christensen-Dalsgaard
- Abstrakt
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 Kred-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 dataobtained 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 ofthe stochastic signal. Results: We obtain results for the frequency of maximum oscillation power (ν_max) and the mean large separation () from different methods for over onethousand red-giant stars. The results for these parameters agree withina few percent and seem therefore robust to the different analysis methods and definitions used here. The uncertainties for ν_max and due to differences in realization noise are not negligible and should be taken into account when using these results for stellar modelling. Table 7 is only available in electronic form at www.aanda.org
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- University of Birmingham, Katholieke Universiteit Leuven, Université de recherche Paris Sciences et Lettres, Université Paris VII - Paris-Diderot, University of British Columbia (UBC), National Center for Atmospheric Research (NCAR), The University of Sydney, Eureka Scientific Inc., University of South Africa (UNISA), Laboratoire d’Astrophysique de Toulouse-Tarbes, Universidad de La Laguna, Instituto de Astrofísica de Canarias (IAC), National Aeronautics & Space Administration (NASA), Space Telescope Science Institute, Aarhus University
- Journal
- Astronomy & Astrophysics
- Band
- 525
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201015185
- Publikationsdatum
- 01-2011
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik
- Schlagwörter
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/733c4671-6453-4957-b03d-9dbc734bb3c8