Optimising the H$\alpha$ index for the identification of activity signals in FGK stars. Improvement of the correlation between H$\alpha$ and CaII H&K

J. Gomes da Silva, A. Bensabat, T. Monteiro +1

In this work we investigate the effect of the H$\alpha$ bandpass width in the correlation between the CaII H&K and H$\alpha$ indices with the aim of improving the H$\alpha$ index to better identi…