DIRECT STELLAR RADIATION PRESSURE AT THE DUST SUBLIMATION FRONT IN MASSIVE STAR FORMATION : EFFECTS OF A DUST-FREE DISK
DIRECT STELLAR RADIATION PRESSURE AT THE DUST SUBLIMATION FRONT IN MASSIVE STAR FORMATION : EFFECTS OF A DUST-FREE DISK
复制标题
大质量恒星形成过程中尘埃升华前沿的直接恒星辐射压力：无尘盘的影响
DOI：
10.1088/2041-8205/739/2/l50
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Tanaka;K.E.I.;Nakamoto;T.
在通过核心吸积形成大质量恒星（≳ 40 M☉）时，作用在尘埃粒子上的直接恒星辐射压力超过了引力，并干扰了尘埃升华前沿（第一个吸收位点）的质量吸积。 10− 3 M☉ yr− 1 的高吸积率产生的冲压压力被认为是克服直接恒星辐射压力所必需的。我们研究了尘埃升华锋面的直接恒星照射，包括内部吸积盘结构。我们证明吸积盘的冲压压力低于尘埃升华前沿的恒星辐射压力。因此，必须有另一种机制来克服直接的恒星辐射压力。我们认为内部热的无尘区域在光学上很厚，可以保护尘埃升华前沿免受恒星直接照射。因此，即使吸积率较低，吸积也不会停止在尘埃升华前沿。
In massive star formation (≳ 40 M☉) by core accretion, the direct stellar radiation pressure acting on the dust particles exceeds the gravitational force and interferes with mass accretion at the dust sublimation front, the first absorption site. Ram pressure generated by high accretion rates of 10− 3 M☉ yr− 1 is thought to be required to overcome the direct stellar radiation pressure. We investigate the direct stellar irradiation on the dust sublimation front, including the inner accretion disk structure. We show that the ram pressure of the accretion disk is lower than the stellar radiation pressure at the dust sublimation front. Thus, another mechanism must overcome the direct stellar radiation pressure. We suggest that the inner hot dust-free region is optically thick, shielding the dust sublimation front from direct stellar irradiation. Thus, accretion would not halt at the dust sublimation front, even at lower accretion rates.