The Role for the Inner Disk in Mass Accretion to the Star in the Early Phase of Star Formation
The Role for the Inner Disk in Mass Accretion to the Star in the Early Phase of Star Formation
复制标题
内盘在恒星形成早期阶段的恒星质量吸积中的作用
DOI：
10.1093/pasj/psu098
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
& Vorobyov E. I.
中科院分区：
文献类型：
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作者：
Ohtani T.;Kimura S. S.;Tsuribe T.;& Vorobyov E. I.
一个物理机制，驱动FU猎户座型爆发被重新考虑。我们研究的影响，一个拱盘的内部覆盖的区域从附近的中心星星的半径约为5 Au（以下简称内盘）。利用内盘上质量吸积率的涨落，通过对一维轴对称模型中非定常粘性吸积盘的数值计算，考虑了内盘的粘性演化和中心星上质量吸积率的时变性.首先，我们计算的演化的内盘假设振荡。结果表明，由于粘性扩散的存在，时间的变化与时间的变化并不一致.其次，我们研究了具有时间常数的自发爆发的性质。由于重力-磁极限环（GML），爆发只发生在yr-1的内盘上的有限质量吸积率范围内。最后，我们讨论的情况下，由GML在内部磁盘所造成的发作和吸积爆发的组合。GML可以驱动吸积爆发到星星上，即使在波动的情况下，虽然波动衰减，同时向内部磁盘传输。我们最近发现了两种爆发模式，一种是自发的，一种是受激的。在受激爆发模式下，直接出现在（后者定义了恒星吸积光度）。在自然爆发模式下，表现为爆发之间的间隔。
A physical mechanism that drives FU Orionis-type outbursts is reconsidered. We study the effect of the inner part of a circumstellar disk covering a region from near the central star to a radius of approximately 5 au (hereafter, the inner disk). Using the fluctuating mass accretion rate onto the inner disk, we consider the viscous evolution of the inner disk and the time variability of the mass accretion rate onto the central starby means of numerical calculation of an unsteady viscous accretion disk in a one-dimensional axisymmetric model. First, we calculate the evolution of the inner disk assuming an oscillating. It is shown that the time variability ofdoes not coincide withdue to viscous diffusion. Second, we investigate the properties of spontaneous outbursts with temporally constant. Outbursts occur only in a limited range of mass accretion rates onto the inner disk ofyr−1due to the gravo-magneto limit cycle (GML). Finally, we discuss the case with a combination of episodicand accretion outbursts caused by the GML in the inner disk. The GML can drive accretion outbursts onto the star even for the case of fluctuating, although fluctuations ofdecay while transmitting the inner disk inwards. We have newly identified two modes of outburst, one spontaneous and one stimulated. In the stimulated mode of outburst,does appear directly in(the latter defining the stellar accretion luminosity). In the spontaneous mode of outburst,appears as the interval between outbursts.