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

Open Access

Fig. 4

X-ray to bolometric flux ratio as function of the index $R_{IRT}^{'}$ $\[R_{\text {IRT }}^{\prime}\]$ for the Gaia DR3 sources with reliable activity index and likely eRASS:5 identification. The color scales with the logarithm of the G_BP − G_RP color. The black dashed and solid lines represent the best fits to the eRASS1 and eRASS:5 data.

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