Observational inputs on the solar/stellar connection: Probing solar analogues with asteroseismology and high-resolution spectroscopy
Paul Beck

Unless located in eclipsing binary systems or clusters, the mass or the radius of a star are challenging parameters to determine. In this talk we discuss what the analysis of space photometry, in particular using asteroseismology, activity and rotation, can do to characterize solar analogues beyond offering the possibility to derive precise mass, radius and surface gravity and how the combined analysis with high-resolution ground-based spectroscopy can contribute to provide a comprehensive picture. The continuous four years of photometric observations of stars collected by the NASA Kepler space telescope have provided data with unparalleled quality and quantity. We selected a set of 20 solar analogues according to their mass, effective temperature, and surface gravity. Highquality Kepler observations provide unique datasets for detailed seismic analysis and further enable the extraction of surface rotation periods and proxies of photospheric magnetic activity. Furthermore, in an extensive, on-going spectroscopic campaign, we collected high-resolution, high-signal-to-noise-ratio spectra with the Hermes spectrograph. Combining these two techniques enables us to explore the solar/stellar connection from a wealth of observational information. Having stellar ages constrained from seismic modeling and gyrochronology allows us to confront it with the stars' lithium abundance. We also studied the chromospheric and photospheric magnetic activity against the stellar parameters from seismology and rotation rate. In this talk, we present the latest results from our series of recent accepted and submitted papers by Beck et al. (2016a,b) and Salabert et al. (2016a,b) comparing our set of solar analogues to the Sun.