Accretion shock on CTTSs and its X-rayemission

摘要

High spectral resolution X-ray observations of classical T Tauri stars (CTTSs) demon-strate the presence of plasma at T ~2 — 3 x 10~6K and n_e ~10~(11)—13)cm~(-3).Stationary modelssuggest that this emission is due to shock-heated accreting material. We address this issue by a 1-D hydrodynamic model of the impact of the accretion flow onto a chromosphere of a CTTS withthe aim of investigating the stability of accretion shock and the role of the chromosphere. Oursimulations include the effects of gravity, radiative losses from optically thin plasma, the thermalconduction and a detailed modeling of the stellar chromosphere. Here we present the results of asimulation based on the parameters of the CTTS MP Mus.