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Table 1.
Definition of the characteristic parameters and spectral band samples of the Ca II K line core.
| Band sample | Central wavelength [Å] | Width [Å] |
|---|---|---|
| K-index | 3933.7 | ±0.52 |
| K2V | 3933.5 | ±0.065 |
| K2R | 3933.9 | ±0.065 |
| K3 | 3933.7 | ±0.065 |
| Parameter | Definition | |
| Emission strength | K2V/K3 | |
| K2-asymmetry | (K2V − K2R)/(K2V + K2R) | |
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