Other
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101..334k&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 6, p. 334 - 343 (2008)
Other
Emission-Line Stars, T-Tauri Stars
Scientific paper
T-Tauri stars (TTS) are low-mass pre-main-sequence stars in the evolutionary state from infrared stellar objects to main-sequence stars. It has been generally accepted that the classical TTSs with strong Hα emission are younger part of TTS evolution than the weak-lined TTS with weak Hα emission. Recent infrared observations opened a debate on whether CTTS are really younger than WTTS or not. Similar debate is also seen in the origin of X-ray emission from CTTS and WTTS. Infrared companions of T Tau (T Tau Sa, b) revealed remarkable light and colour variations along with some jet-like activity around these stars. In another typical CTTS, TW Hya, a giant planet is discovered as the first planet associated with pre-main-sequence stars younger than 10 million years. FU Ori stars (FUOrs) are characterized by large amplitude brightening and slow declining of light. Thermal instability inside an accretion disk is a candidate of the origin of FUOr phenomena, but yet debatable. Finally, the roles of angular momentum transfer and magnetism in the evolution of pre-main-sequence stars and accretion disks are briefly reviewed.
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