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

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Fig. 7

X-ray to bolometric flux ratio as function of the index $R_{IRT}^{'}$ $\[R_{\text {IRT }}^{\prime}\]$ for likely eRASS:5 identifications with Gaia DR3 sources of different spectral type (see text for details). The color scales with the number of sources within the bin and the black dashed and solid lines represent the best eRASS1 and eRASS:5 fits (cf. Table 2).

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