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T-Tauri star

(TTS)
(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 (2.5 solar mass or less). They often have protoplanetary disks and are near molecular clouds. Their energy is from gravitation rather than fusion, the latter not yet started. They generally have a short rotation period (1-12 days).


(star type,variable,stellar evolution)
http://en.wikipedia.org/wiki/T_Tauri_type_stars

Referenced by:
GG Tau
HL Tau
Lick Observatory Calcium Line Survey (LkCl)
Pico dos Dias Survey (PDS)
pre-main-sequence star (PMS)
protoplanetary disk (PPD)
protostar
stellar age determination
stellar association
stellar evolution
T Tauri
TW Hydrae association (TWA)
TW Hydrae (TW Hya)
variable star

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