Astrophysics (Index)About

FU Orionis star

(FUor, FU Orionis object, FU Ori star)
(type of variable pre-main-sequence star)

A FU Orionis star (or FU Orionis object or FU Ori star or abbreviated FUor) is a type of variable star that shows large changes in magnitude over fairly long periods, e.g., growing brighter over the course of some year and remaining bright for as much as a decade before dimming again. Current interpretation is a pre-main-sequence star, the transients stemming from periods of accretion from a protoplanetary disk. Observations have shown signs suggesting disk instability. The name of this class of stars stems from the first such star noted, FU Orionis (aka FU Ori).

(star type,variable,stellar evolution)
Further reading:

Referenced by pages:
pre-main-sequence star (PMS)
variable star