Atmospheric parameters of 82 red giants in the Kepler field
Context: Accurate fundamental parameters of stars are essential for the asteroseismic analysis of data from the NASA Kepler mission. Aims: We aim at determining accurate atmospheric parameters and the abundance pattern for a sample of 82 red giants that are targets for the Kepler mission. Methods: W...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
16 July 2012
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| In: |
Astronomy and astrophysics
Year: 2012, Jahrgang: 543 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201219237 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1051/0004-6361/201219237 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2012/07/aa19237-12/aa19237-12.html 
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| Verfasserangaben: | A.O. Thygesen, S. Frandsen, H. Bruntt, T. Kallinger, M.F. Andersen, Y.P. Elsworth, S. Hekker, C. Karoff, D. Stello, K. Brogaard, C. Burke, D.A. Caldwell, and J.L. Christiansen |
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| 245 | 1 | 0 | |a Atmospheric parameters of 82 red giants in the Kepler field |c A.O. Thygesen, S. Frandsen, H. Bruntt, T. Kallinger, M.F. Andersen, Y.P. Elsworth, S. Hekker, C. Karoff, D. Stello, K. Brogaard, C. Burke, D.A. Caldwell, and J.L. Christiansen |
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| 520 | |a Context: Accurate fundamental parameters of stars are essential for the asteroseismic analysis of data from the NASA Kepler mission. Aims: We aim at determining accurate atmospheric parameters and the abundance pattern for a sample of 82 red giants that are targets for the Kepler mission. Methods: We have used high-resolution, high signal-to-noise spectra from three different spectrographs. We used the iterative spectral synthesis method VWA to derive the fundamental parameters from carefully selected high-quality iron lines. After determination of the fundamental parameters, abundances of 13 elements were measured using equivalent widths of the spectral lines. Results: We identify discrepancies in log g and [Fe/H], compared to the parameters based on photometric indices in the Kepler Input Catalogue (larger than 2.0 dex for log g and [Fe/H] for individual stars). The T eff found from spectroscopy and photometry shows good agreement within the uncertainties. We find good agreement between the spectroscopic log g and the log g derived from asteroseismology. Also, we see indications of a potential metallicity effect on the stellar oscillations. Conclusions: We have determined the fundamental parameters and element abundances of 82 red giants. The large discrepancies between the spectroscopic log g and [Fe/H] and values in the Kepler Input Catalogue emphasize the need for further detailed spectroscopic follow-up of the Kepler targets in order to produce reliable results from the asteroseismic analysis. | ||
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