High-Resolution Spectroscopy of Winds Associated with T Tauri Stars

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2016,（2）
• 页码范围: 89-96
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/16/2/030

摘要

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(A),in addition to those of [O Ⅰ] at 5577(A) and 6300(A),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 × 106 cm-3-2.5 × 109 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 × 10-10 M☉ yr-1 to 1.4 × 10-9 M☉ 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.