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| Paper: |
Chromospheric Long Term Activity of Very Cool Stars |
| Volume: |
472, New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets |
| Page: |
213 |
| Authors: |
Mauas, P. J. D.; Buccino. A. P. |
| Abstract: |
We study the long-term chromospheric activity of dM stars, using in
particular the results of an observational program we started in 1999, to
systematically obtain mid-resolution spectra of late-type stars.
First, we discuss which are good activity indicators for these stars.
We investigated the relation between the activity measurements in the
calcium and hydrogen lines, and found that the usual correlation
observed reflects differences between stars, and it
is not always preserved for simultaneous observations of a particular
star.
Later we investigate the variations in individual stars, and we report
cyclic activity in four dM stars, including Prox-Cen. |
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