12 Years of Stellar Activity Observations in Argentina

Details 12 Years of Stellar Activity Observations in Argentina 12 Years of Stellar Activity Observations in Argentina

2012-04-18

arxiv.org/abs/1204.4101v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pges. Accepted for publicaction in Procceedings IAU Symposium 286

Scientific paper

We present an observational program we started in 1999, to systematically obtain mid-resolution spectra of late-type stars, to study in particular chromospheric activity. In particular, we found cyclic activity in four dM stars, including Prox-Cen. We directly derived the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigated the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar color, and it is not always preserved when simultaneous observations of a particular star are considered. We also used our observations to model the chromospheres of stars of different spectral types and activity levels, and found that the integrated chromospheric radiative losses, normalized to the surface luminosity, show a unique trend for G and K dwarfs when plotted against the S index.

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