(type of variable pre-main-sequence star)
A T-Tauri star (TTS) is a variable star with certain specific
emission lines (hydrogen, Ca II, Fe I, S II, O I,
Li I), judged to be very young (pre-main-sequence star) dwarfs of about
2.5 solar mass or less. They often have protoplanetary disks
and are near molecular clouds. Their energy is presumed to be
from gravitation (Kelvin-Helmholtz mechanism) rather than fusion,
the latter not yet triggered.
They generally have a short rotation period in the range of 1-12 days.
- CTTS (classical T-Tauri star) extensive disk with indicated by strong emission lines.
- WTTS (weak-line T-Tauri star) weak or non-existent signs of a disk.
- NTTS (naked T-Tauri star) sometimes used synonymously with WTTS, but sometimes both terms are used to distinguish between "weak" and"non-existent".
(star type,variable,stellar evolution)
Referenced by pages:
Lick Observatory Calcium Line Survey (LkCl)
Pico dos Dias Survey (PDS)
pre-main-sequence star (PMS)
protoplanetary disk (PPD)
stellar age determination
TW Hydrae association (TWA)
TW Hydrae (TW Hya)