High-Resolution Spectroscopy of Winds Associated with T Tauri Stars

作者：Iguchi Naoto; Itoh Yoichi^*

来源：Research in Astronomy and Astrophysics, 2016, 16(2): UNSP 30.

DOI：10.1088/1674-4527/16/2/030

• stars: pre-main sequence
• stars: emission lines

We carried out optical high-resolution spectroscopy of T Tauri stars using the Subaru Telescope. Using archived data from the Keck Telescope and the Very Large Telescope, we detected forbidden lines of [S II] at 4069 angstrom, in addition to those of [O I] at 5577 angstrom and 6300 angstrom, for 13 T Tauri stars. We consider that low-velocity components of these forbidden lines emanate from the wind associated with T Tauri stars. Using two flux ratios of the three lines, we simultaneously determined the hydrogen density and temperature of the winds. The winds of T Tauri stars have a hydrogen density of 2.5 x 10(6) cm(-3) -2.5 x 10(9) cm-(3) and a temperature of 10 800 -18 000 K. The mass loss rates by the wind are estimated to lie in the range from 2.0 x 10(-1)0 M-circle dot yr(-1) to 1.4 x 10(-9) M-circle dot yr(-1). The mass loss rates are found to increase with increasing mass accretion rates. The ratio of the mass loss rate to the mass accretion rate is 0.001-0.1 for classical T Tauri stars and 0.1-1 for transitional disk objects.

• 出版日期2016-2