제목 : A New Paradigm for Star Formation: Episodic Accretion
연사 : 이정은 교수님 (경희대학교)
언어 : Korean
a detailed understanding of the process of star formation is fundamental for
studies of planet formation and galaxy formation/evolution, the actual
accretion process to protostars is not yet well understood. The standard model
for low mass star formation predicted a constant (~2 x 10-6 Msun
yr-1) steady accretion process. However, this accretion rate gives
rise to the classic "luminosity problem" whereby accretion at such a
rate produces accretion luminosities higher than typically observed in embedded
protostars, exceeding the predictions by a factor of 10 to 100.
Episodic accretion has been suggested as one possible solution to the luminosity problem. In the episodic accretion model, a protostar stays in the prolonged quiescent phase interrupted by short burst accretions. Therefore, protostars have low luminosities during most of the evolution. I will talk about theoretical predictions and observational evidences of the episodic accretion toward low mass protostars.