Spectral Energy Distribution for T Tauri Stars with a Debris Disk

Abstract The analysis results of spectral energy distribution (SED) curves in the range 0.36–100 μm for 45 young WTTS-type stars and 9 comparison CTTS-type stars are presented. Two types of SED curves are observed according to the classification of the spectra of young stars. Stars with type III spectra show excess emission only in the far IR range, at λ ≥ 12 µm. Stars with type II spectra, in addition to emission in the far IR range, also show excess emission in the near IR range, at 2 μm < λ < 12 μm. A new subtype of IIId stars from the group of stars with type III spectra has been identified. These stars have a weak IR excess in the spectrum in the range λ ≥ 60 μm, signs of debris disks, and often show chromospheric activity. It is shown that 15 out of 45 WTTSs have UV excesses, and the same number of stars have near-IR excesses. Two of these stars are type II in their spectra and show signs of disk accretion. The physical parameters and parameters of excess radiation are determined, and the masses and ages of program stars are estimated.