Open Access

Fig. 10

image

Download original image

Fractional chromospheric Hα flux, , as a function of fractional chromospheric Ca II H and K flux, flux. Filled symbols indicate stars without known planetary systems, and open symbols indicate stars with known planetary systems. Values >0 indicate that Hα is in emission, and values <0 indicate that Hα is in absorption. Values near 0 indicate filling-in of the line to the continuum.

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.