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Comparing the CaiiH and K Emission Lines in Red Giant Stars
Publications of the Astronomical Society of the Pacific
Measurements of the asymmetry of the emission peaks in the core of the Ca II H line for 105 giant stars are reported. The asymmetry is quantified with the parameter V/R, defined as the ratio between the maximum number of counts in the blueward peak and the redward peak of the emission profile. The Ca II H and K emission lines probe the differential motion of certain chromospheric layers in the stellar atmosphere. Data on V/R for the Ca II K line are drawn from previous papers and compared todoi:10.1086/605456 fatcat:yo642p5ttrd5nj7ymdupbfm34y