Correlation between activity indicators: H\alpha and Ca II in M stars

MAUAS, P. J. D.; IBAÑEZ BUSTOS, R. V.; BUCCINO, A. P.

Viedma

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2019

The magnetic fields responsible for the stellar activity are generated by the stellar dynamo mechanism.Several late-type stars present activity cycles similar to the 11-year solar cycle.The standard stellar activity indicator used is the Mount Wilson S-index. However, due to the low intrinsic luminosity of dM stars the S index is not always suitable for studying the chromospheric activity on these fainter stars. Therefore, it is necessary to explore redder activity indicators in late-type stars. It is well known that the correlation between the the Ca II- and Hα line-core fluxes is positive in the solar case for the whole solar-cycle.In this work, we present a study of the relation between Hα and Ca II - in a set of 14 M stars from observations obtained under the HKα Project, which operates in the {Complejo Astronómico El Leoncito} (CASLEO) since 1999.