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Fig. 7


Feature classification examples for the Ca II K line computed using Model 2. The intensity profile (solid black) is crossed by vertical lines denoting the K1V (dashed blue), K2V (solid blue), K3 (solid green), K2R (solid red), K1R (dashed red) features. Panel a: standard profile with two emission peaks is shown. Panel b: single-peaked emission is represented. Panel c: pure absorption is shown. Panel d: complex profile with multiple emission and absorption features is represented. Intensity units are 10−6 erg cm−2 Hz−1 s−1 ster−1 .

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