Stellar Population Astrophysics (SPA) with the TNG - Measurement of the He I 10 830 Å line in the open cluster Stock 2

Open Access

Fig. 7

Ca II H&K spectra for stars g1–g5, scaled to the PHOENIX scale. The vertical grey strips indicate the lines masked out before the spline fitting, and the orange shaded areas in the middle of the lines are used for measuring the $\log R_{HK}^{'}$ $\log R_{{\rm{HK}}}^\prime$ index.

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