Astrophysics (index)about

pre-main-sequence star

(PMS, PMS object)
(star not yet with a nuclear reaction)

A pre-main-sequence star (PMS or PMS object) is a star in an early stage after being a protostar and before becoming a main sequence star, in other words, before its hydrogen burning. At this early point, the star's energy is from gravitational contraction.

Some types:

Two distinctions used to classify pre-main-sequence stars and protostars are:

Active pre-main-sequence stars often emit X-rays and ultraviolet rays.

(star type,stellar evolution,protostars)

Referenced by:
evolutionary track
FU Orionis star (FUor)
gravitational collapse
Hayashi track
main sequence star (V)
stellar evolution
T-Tauri star (TTS)
X-ray source (RS)
young stellar object (YSO)