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We identify a set of 18 solar analogs among the seismic sample of solar-likestars observed by the Kepler satellite rotating between 10 and 40 days. Thisset is constructed using the asteroseismic stellar properties derived usingeither the global oscillation properties or the individual acousticfrequencies. We measure the magnetic activity properties of these stars usingobservations collected by the photometric Kepler satellite and by theground-based, high-resolution Hermes spectrograph mounted on the Mercatortelescope. The photospheric (Sph) and chromospheric (S index) magnetic activitylevels of these seismic solar analogs are estimated and compared in relation tothe solar activity. We show that the activity of the Sun is comparable to theactivity of the seismic solar analogs, within the maximum-to-minimum temporalvariations of the 11-year solar activity cycle 23. In agreement with previousstudies, the youngest stars and fastest rotators in our sample are actually themost active. The activity of stars older than the Sun seems to not evolve muchwith age. Furthermore, the comparison of the photospheric, Sph, with thewell-established chromospheric, S index, indicates that the Sph index can beused to provide a suitable magnetic activity proxy which can be easilyestimated for a large number of stars from space photometric observations.

astronomy and astrophysics

Photospheric and chromospheric magnetic activity of seismic solar  analogs. Observational inputs on the solar/stellar connection from Kepler and  Hermes