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Fig. 8


A four-panel Eddington–Barbier line formation diagram for the Ca II K from the FAL-C model atmosphere in CRD. The computations are performed with three different cases: without microturbulence (ξ(z) = 0 km s−1; blue line), microturbulence (ξ(z) = 5 km s−1; red line), and with a deeper temperature rise and microturbulence (green line). Panel a: the total opacity as function of wavelength at the formation height of the peaks; panel b: the optical depth as function of height at the wavelength of at K2V (dashed) and K3 (solid); panel c: the vertically emergent intensity for the K line, and panel d: the gas temperature as a function of height (solid and dashed black) with the line source function (solid colored). The cross marks the position of K1V in panel c and the dot indicates the position of the K2V in panel a and K2V/K3 in panel c.

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