A Hot Wind from the Classical T Tauri Stars: TW Hydrae and T Tauri
Abstract
Spectroscopy of the infrared He I (10830 Å) line with NIRSPEC on Keck and CSHELL at the IRTF, and of the ultraviolet C III (977 Å) and O VI (1032 Å) emission with FUSE, reveals that the classical T Tauri star TW Hydrae exhibits P Cygni profiles, line asymmetries, and absorption indicative of a continuous, fast (~400 km s-1), hot (~300,000 K) accelerating outflow with a mass-loss rate ~10-11 to 10-12 Msolar yr-1 or larger. Spectra of T Tau N appear consistent with such a wind. The source of the emission and outflow seems restricted to the stars themselves. Although the mass accretion rate is an order of magnitude less for TW Hya than for T Tau, the outflow reaches higher velocities at chromospheric temperatures in TW Hya. Winds from young stellar objects may be substantially hotter and faster than previously thought.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2005
- DOI:
- 10.1086/431323
- arXiv:
- arXiv:astro-ph/0505037
- Bibcode:
- 2005ApJ...625L.131D
- Keywords:
-
- Infrared: Stars;
- Stars: Individual: Constellation Name: TW Hydrae;
- Stars: Individual: Constellation Name: T Tauri;
- Stars: Pre-Main-Sequence;
- Stars: Winds;
- Outflows;
- Ultraviolet: Stars;
- Astrophysics
- E-Print:
- To be published in: Astrophysical Journal Letters