Clara Régulo

TL;DR: In this article, a grid-based analysis was used to estimate the fundamental properties of more than 500 main-sequence and sub-giant stars using the NASA Kepler data obtained during the first 10 months of Kepler science operations, when these solar-type targets were observed for one month each in survey mode.

TL;DR: It is found that the distribution of observed masses of these stars shows intriguing differences to predictions from models of synthetic stellar populations in the Galaxy.

TL;DR: In this paper, the fundamental properties of more than 500 main-sequence and sub-giant stars were estimated using the NASA Kepler mission data using two global asteroseismic parameters and complementary photometric and spectroscopic data.

TL;DR: Photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, are analyzed for signatures of stellar magnetic activity and provide constraints for stellar dynamo models under conditions different from those of the Sun.

Abstract: We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overall metallicity is well represented by Fe lines. Relative abundances of light elements (CNO) and α elements are generally higher for low-metallicity stars. Our spectroscopic analysis benefits from the accurately measured surface gravity from the asteroseismic analysis of the Kepler light curves. The accuracy on the log g parameter is better than 0.03 dex and is held fixed in the analysis. We compare our T eff determination with a recent colour calibration of V T − KS [TYCHO V magnitude minus Two Micron All Sky Survey (2MASS) KS magnitude] and find very good agreement and a scatter of only 80 K, showing that for other nearby Kepler targets, this index can be used. The asteroseismic log g values agree very well with the classical determination using Fe I–Fe II balance, although we find a small systematic