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Accretion onto Pre-Main-Sequence Stars
Annual Review of Astronomy and Astrophysics ( IF 33.3 ) Pub Date : 2016-09-19 , DOI: 10.1146/annurev-astro-081915-023347
Lee Hartmann 1 , Gregory Herczeg 2 , Nuria Calvet 1
Affiliation  

Accretion through circumstellar disks plays an important role in star formation and in establishing the properties of the regions in which planets form and migrate. The mechanisms by which protostellar and protoplanetary disks accrete onto low-mass stars are not clear; angular momentum transport by magnetic fields is thought to be involved, but the low-ionization conditions in major regions of protoplanetary disks lead to a variety of complex nonideal magnetohydrodynamic effects whose implications are not fully understood. Accretion in pre-main-sequence stars of masses ≲1M⊙ (and in at least some 2–3-M⊙ systems) is generally funneled by the stellar magnetic field, which disrupts the disk at scales typically of order a few stellar radii. Matter moving at near free-fall velocities shocks at the stellar surface; the resulting accretion luminosities from the dissipation of kinetic energy indicate that mass addition during the T Tauri phase over the typical disk lifetime ∼3 Myr is modest in terms of stellar evo...

中文翻译:

吸积到主序前恒星上

通过星周盘的吸积在恒星形成和确定行星形成和迁移区域的特性方面起着重要作用。原恒星和原行星盘吸积到低质量恒星上的机制尚不清楚。磁场角动量传输被认为与此有关,但原行星盘主要区域的低电离条件导致了各种复杂的非理想磁流体动力学效应,其含义尚不完全清楚。质量为 ≲1M⊙ 的前主序星(以及至少在某些 2-3-M⊙ 系统中)的吸积通常是由恒星磁场形成的,这会在通常为几个恒星半径数量级的尺度上破坏圆盘。以接近自由落体速度运动的物质在恒星表面发生冲击;
更新日期:2016-09-19
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