Paper:	Long-term Stellar Activity Variations of Stars from the HARPS M-dwarf Sample: Comparison Between Activity Indices
Volume:	448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Page:	1117
Authors:	Gomes da Silva, J.; Santos, N. C.; Bonfils, X.
Abstract:	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 SCaI I and Na I is very strong and does not depend on the activity level of the stars, (ii) the correlation between our SCaI I and Hα seems to depend on the activity level of the stars, and (iii) there is no strong correlation between SCaI I and He I for these type of stars.

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