Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-19
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figure, 1 table, to appear in the proceedings of IAU Symposium 243 "Star-Disk Interaction in Young Stars" (Grenoble
Scientific paper
10.1017/S1743921307009477
We calculated profiles of CIV 1550, Si IV 1400, NV 1240 and OVI 1035 doublet lines using results of 3D MHD simulations of disc accretion onto young stars with dipole magnetic field. It appeared that our calculations can not reproduce profiles of these lines observed (HST/GHRS-STIS and FUSE) in CTTSs's spectra. We also found that the theory predicts much larger C IV 1550 line flux than observed (up to two orders of magnitude in some cases) and argue that the main portion of accretion energy in CTTSs is liberated outside accretion shock. We conclude that the reason of disagreement between the theory and observation is strongly non-dipole character of CTTS's magnetic field near its surface.
Kravtsova S. A.
Lamzin Sergei A.
Romanova Marina M.
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