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Combining asteroseismology and spectroscopy for obtaining precise abundances: CoRoT-GES and K2-RAVE

Published online by Cambridge University Press:  02 August 2018

M. Valentini Open the ORCID record for M. Valentini [Opens in a new window]  and
CoRoT-GES and K2-RAVE collaborations
M. Valentini
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected]
CoRoT-GES and K2-RAVE collaborations
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany email: [email protected]
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Abstract

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The spectroscopic analysis of red giant stars is hampered by difficulties in determining the surface gravity, log g. The presence of degeneracies, few lines sensitive to log g, limited spectral coverage and bad signal-to-noise, can affect the precision and accuracy of log g and, as a consequence, the quality of the element abundances. We show how the adoption of the seismic surface gravity can improve the spectroscopic analysis of red giants. As examples, we adopted the seismic gravity in the analysis of spectra taken by two different surveys: GES (high resolution) and RAVE (intermediate resolution). The results of this technique were the lifting of the log g-Teff degeneracy and more accurate and precise atmospheric parameters and abundances.

Keywords

stars: fundamental parametersstars: abundancessurveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 162 - 165
Copyright
Copyright © International Astronomical Union 2018 

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