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

Abstract

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 spect…