Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-12-16
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
6 pages, 3 figures, 1 table, Proceedings of the 16th Workshop on Cool Stars, Stellar Systems, and the Sun (Seattle, WA, Aug 29
Scientific paper
We used four known chromospheric activity indicators to measure long-term activity variations in a sample of 23 M-dwarf stars from the HARPS planet search program. We compared the indices using weighted Pearson correlation coefficients and found that in general (i) the correlation between $S_{CaII}$ and \ion{Na}{i} is very strong and does not depend on the activity level of the stars, (ii) the correlation between our $S_{CaII}$ and H$\alpha$ seems to depend on the activity level of the stars, and (iii) there is no strong correlation between $S_{CaII}$ and \ion{He}{i} for these type of stars.
Bonfils Xavier
Da Silva Gomes J.
Santos Nuno Cardoso
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