Fig. 6
Download original image
Observed hardness ratio HR1 with 1σ uncertainties vs the Gaia G – RP colour for the stars in our sample. The median hardness ratio, corresponding to a coronal temperature of about 0.3 keV, is depicted by the dashed line. The quite blue star to the left is the Herbig Be star HD 100546, a known X-ray emitter (Skinner & Güdel 2020).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.