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Observational inputs on the solar/stellar connection from the Kepler satellite and the Hermes spectrograph: activity, rotation, lithium of solar analogs
Paul Beck (CEA, Paris-Saclay), D. Salabert (CEA, Paris-Saclay), R.A. Garcia (CEA, Paris-Saclay), J. Do Nascimento (CfA, Harvard, USA / Universidade Federal do Rio, Brazil), et al.
The unprecedented quality of the continuous 4-yr photometric observations collected by the Kepler satellite allowed the measurements of acoustic oscillations in hundreds of solar-like stars. The addition of asteroseismic data was proven to provide the most accurate fundamental properties that can be derived from stellar modeling today. Moreover, the length of the Kepler dataset provides a unique source of information for detecting magnetic activity. In this poster, we will present our latest results on the solar/stellar connection by studying oscillating 18 solar analogs that we identified among the Kepler seismic sample. We measured their magnetic activity properties using the observations collected by the Kepler satellite and ground-based, high-resolution Hermes spectrograph. The photospheric (Sph) and chromospheric (S index) magnetic activity levels of these seismic solar analogs are compared in relation to the solar activity. We show that the activity of the Sun is actually comparable to the activity of the seismic solar analogs. Furthermore, we will discuss the fundamental parameters and lithium abundances derived from the Hermes observations.