Fig. 8.
Soft excess of T Tau compared with other T Tauri stars as well as main sequence stars. Main sequence stars are mainly from Ness et al. (2002, 2004). The decrease of the O VII to O VIII ratio with increasing oxygen luminosity is a result of the increasing average coronal temperature for increasingly active MS stars (e.g., Johnstone & Güdel 2015). Plot symbol sizes scale with mass accretion rate.
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