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• W2885580348 abstract "We present an empirical study of the strength of magnetic stellar activity among cool giant stars on the red and asymptotic giant branches using the Ca ii H&K chromospheric emission strength measured in the context of the Mount Wilson project. Because we consider only stars with a parallax error smaller than 10 per cent, the stars can be accurately placed into an empirical Hertzsprung–Russell diagram and their evolutionary status can be reliably assessed from a comparison with calibrated evolutionary tracks. We find that S-index values among evolved giants redder than 1.5 in B − V and with luminosity classes I and II are larger than those found among the progenitor K giants with luminosity class III and B − V < 1.3. Converting the measured S-indices into physical chromospheric surface fluxes, we find that chromospheric heating undergoes a remarkable reversal and revival as giant luminosity increases. We also discuss possible explanations for this new finding." @default.
• W2885580348 created "2018-08-22" @default.
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• W2885580348 date "2018-08-08" @default.
• W2885580348 modified "2023-09-27" @default.
• W2885580348 title "Stellar activity of evolved, cool giants – old questions revisited" @default.
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• W2885580348 doi "https://doi.org/10.1093/mnras/sty1942" @default.
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