High-Resolution Spectroscopy of Winds Associated with T Tauri Stars

• Published in: arXiv.org 2020-06
• Main Authors: Iguchi, Naoto, Itoh, Yoichi
• Format: Article
• Language: English
• Subjects: Density; Deposition; High resolution; Reflecting telescopes; Spectroscopy; Spectrum analysis; Stellar winds; T Tauri stars; Telescopes; Very Large Telescope
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2006.01124

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 \(2.5 \times 10^{6}\) cm\(^{-3}\) - \(2.5 \times 10^{9}\) cm\(^{-3}\) and a temperature of 10800 -18000 K. The mass loss rates by the wind are estimated to lie in the range from \(2.0 \times 10^{-10}\) M\(_{\odot}\) yr\(^{-1}\) to \(1.4 \times 10^{-9}\) M\(_{\odot}\) 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.