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

Open Access

Fig. 2

Distribution of log( $R_{IRT}^{'}$ $\[R_{\text {IRT }}^{\prime}\]$ ) for Gaia DR3 sources. Upper panel: total number of all sources (blue histogram) and those sources identified as eRASS1 and eRASS:5 X-ray emitters (red dashed and solid histogram). Lower Panel: X-ray detection fraction vs. $R_{I R T}^{'}$ $\[R_{\mathrm{IRT}}^{\prime}\]$ -index; the dashed line indicates the boundary between the HA and VHA groups (see text for details).

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