The stellar corona-chromosphere connection - A comprehensive study of X-ray and Ca II IRT fluxes from eROSITA and Gaia

Open Access

Fig. 6

Color–magnitude diagram of the eRASS:5 sources with reliable activity index in Gaia DR3. The color scales with the index $R_{IRT}^{'}$ $\[R_{\text {IRT }}^{\prime}\]$ . The solid line indicates the main sequence and sources located on the dashed line are 2 mag brighter than main sequence sources.

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