Martinez, C.

Variability in Active Binaries: the stellar metallicity and activity correlation

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Thursday 11th
Variability in Active Binaries: the stellar metallicity and activity correlation
Observational studies suggest that elemental abundances measured from stellar spectra can correlate with magnetic stellar activity: the changes in the cool spots fraction that covers the stellar surface during the activity cycle, may play a role varying the equivalent widths from many spectral lines. Therefore, studying the effects of magnetic activity on stellar spectra is an important step to understand how the stellar activity level can affect the spectroscopic determination of stellar parameters and chemical abundances. Parameters such as effective temperature, metallicity, and surface gravity are not only important for the characterization of stars themselves, but also for characterizing exoplanets, as the planetary radius and mass depend on the adopted properties of its host star. In this sense, binary systems are excellent laboratories to explore the abundance and stellar activity correlation because its tidally locked rotation may induce significant transformations in the stellar structure originating much higher levels of magnetic activity. In this contribution, we will present preliminary results of the spectroscopic and long-term periodicity analysis of a RS Canum Venaticorum (RS CVn) type system, an active binary consisting of a red giant primary star and an unseen main sequence secondary star. The study over the primary star is based on spectroscopic observations obtained in the framework of the HKα Project initiated by IAFE in 1999 and currently in progress.