Issue |
A&A
Volume 525, January 2011
|
|
---|---|---|
Article Number | A131 | |
Number of page(s) | 31 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/201015185 | |
Published online | 08 December 2010 |
Solar-like oscillations in red giants observed with Kepler: comparison of global oscillation parameters from different methods⋆
1
University of Birmingham, School of Physics and Astronomy,
Edgbaston, Birmingham
B15 2TT, UK
e-mail: saskia@bison.ph.bham.ac.uk
2
Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan
200D, 3001
Leuven,
Belgium
3
LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis
Diderot, Observatoire de Paris, 92195
Meudon Cedex,
France
4
Laboratoire AIM, CEA/DSM-CNRS, Université Paris 7 Denis
Diderot, IRFU/SAp, Centre de Saclay, 91191
Gif-sur-Yvette,
France
5
Department of Physics and Astronomy, University of British
Colombia, 6224 Agricultural Road,
Vancouver, BC
V6T 1Z1,
Canada
6
Institute for Astronomy, University of Vienna,
Türkenschanzstrasse 17,
1180
Vienna,
Austria
7
High Altitude Observatory, NCAR, PO Box 3000, Boulder, CO
80307,
USA
8 Sydney Institute for Astronomy (SIfA), School of Physics,
University of Sydney, NSW 2006, Australia
9
Eureka Scientific, 2452 Delmer Street Suite 100,
Oakland, CA
94602-3017,
USA
10 Department of Mathematical Sciences, University of South
Africa, Box 392, UNISA 0003, South Afrika
11
Laboratoire d’Astrophysique de Toulouse-Tarbes, Université de
Toulouse, CNRS, 31400
Toulouse,
France
12
Universidad de La Laguna, Dpto de Astrofísica, 38206
Tenerife,
Spain
13
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
14
NASA Ames Research Center, MS 244-30, Moffet Field, CA
94035,
USA
15
SETI Institute, NASA Ames Research Center, MS 244-30, Moffet Field, CA
94035,
USA
16
Orbital Sciences Corp., NASA Ames Research Center,
Moffet Field, CA
94035,
USA
17
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD
21218,
USA
18
Department of Physics and Astronomy, Building 1520, Aarhus
University, 8000
Aarhus C,
Denmark
Received:
9
June
2010
Accepted:
13
August
2010
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.
Conclusions.
Key words: asteroseismology / stars: late-type / methods: observational / techniques: photometric
Table 7 is only available in electronic form at http://www.aanda.org
© ESO, 2010
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