Energetic Winds and Circumstellar Disks Associated with Low Mass Young Stellar Objects

摘要: The properties of energetic winds (Lwind/L* > 0. 01) and circumstellar disks are reviewed for three classes low mass (M 01 MΘ) disks. best available evidence suggests that these self-luminous, viscous accretion it seems attractive to suggest material through such may be the ultimate powering source winds. formation solar system dimension appears a common, if not an inevitable consequence star process. timescale disk exhaustion (through all remnant matter) or dissipation disruption by winds, possibly following planet building) range from ~105 ~107 years. transition between active TTS (characterized wind producing excess uv, optical infrared emission) NTTS (no disk, no wind, relatively weak chromospheric is suggested arise dissipation. factors which control rate evolution (and thus lifetime YSO as TTS) linked initial conditions obtain in protostellar cores (mass, velocity dispersion, angular momentum).