Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii
Article
Article Title | Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii |
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ERA Journal ID | 1058 |
Article Category | Article |
Authors | Yu, Jie (Author), Huber, Daniel (Author), Bedding, Timothy R. (Author), Stello, Dennis (Author), Hon, Marc (Author), Murphy, Simon J. (Author) and Khanna, Shourya (Author) |
Journal Title | Astrophysical Journal Supplement Series |
Journal Citation | 236 (2), pp. 42-59 |
Article Number | 42 |
Number of Pages | 18 |
Year | 2018 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0067-0049 |
1538-4365 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4365/aaaf74 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4365/aaaf74 |
Abstract | The Kepler mission has provided exquisite data to perform an ensemble asteroseismic analysis on evolved stars. In this work we systematically characterize solar-like oscillations and granulation for 16,094 oscillating red giants, using end-of-mission long-cadence data. We produced a homogeneous catalog of the frequency of maximum power (typical uncertainty sigma(nu max) = 1.6% ), the mean large frequency separation (sigma(Delta nu) = 0.6%), oscillation amplitude (sigma(A) = 4.7%), granulation power (sigma(gran) = 8.6%), power excess width (sigma(width) = 8.8%), seismically derived stellar mass (sigma(M) = 7.8%), radius (sigma(R) = 2.9%), and thus surface gravity (sigma(log g) = 0.01 dex). Thanks to the large red giant sample, we confirm that red-giant-branch (RGB) and helium-core-burning (HeB) stars collectively differ in the distribution of oscillation amplitude, granulation power, and width of power excess, which is mainly due to the mass difference. The distribution of oscillation amplitudes shows an extremely sharp upper edge at fixed nu(max), which might hold clues for understanding the excitation and damping mechanisms of the oscillation modes. We find that both oscillation amplitude and granulation power depend on metallicity, causing a spread of 15% in oscillation amplitudes and a spread of 25% in granulation power from [Fe/H] = -0.7 to 0.5 dex. Our asteroseismic stellar properties can be used as reliable distance indicators and age proxies for mapping and dating galactic stellar populations observed by Kepler. They will also provide an excellent opportunity to test asteroseismology using Gaia parallaxes, and lift degeneracies in deriving atmospheric parameters in large spectroscopic surveys such as APOGEE and LAMOST. |
Keywords | catalogs, stars: fundamental parameters, stars: oscillations, techniques: photometric, Astrophysics - Solar and Stellar Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Sydney |
University of New South Wales |
https://research.usq.edu.au/item/q73wv/asteroseismology-of-16-000-kepler-red-giants-global-oscillation-parameters-masses-and-radii
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