Fine structure of the age–chromospheric activity relation in solar-type stars: II. Hα line
P V Souza dos Santos,
G F Porto de Mello,
E Costa-Bhering
et al.
Abstract:Excess chromospheric emissions within deep photospheric lines are effective proxies of stellar magnetism for FGK stars. This emission decays with stellar age and is a potential determinant of this important stellar quantity. We report absolutely calibrated H $\alpha$ chromospheric fluxes for 511 solar-type stars in a wide interval of precisely determined masses, [Fe/H], ages, and evolution states from high S/N, moderately high$-$resolution spectra. The comparison of H $\alpha$ and H + K chromospheric fluxes re… Show more
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