在Bondi/Jeans吸积/云系统中由于尘埃和气体进入速度的不相等变化引起的尘埃-气体质量比的富集
Enrichment of the dust-to-gas mass ratio in Bondi/Jeans accretion/cloud systems due to unequal changes in dust and gas incoming velocities
摘要：
Bondi和Jeans长度的比率被用来开发一个云吸积模型，该模型描述了一个内部的Bondi型制度，其中气体压力由中心恒星的重力平衡，以及一个外部的Jeans型制度，其中气体压力由气体自重平衡。由该模型提供的气体密度分布使得从风型内解到Bonnor-Ebert型外解的平滑过渡。它示出，高速尘埃撞击在这个云将倾向于堆积，由于具有不同的速度剖面比气体，使尘-气比是大大丰富的1%以上的ISM水平。
英文摘要：
The ratio of the Bondi and Jeans lengths is used to develop a cloud-accretion model that describes both an inner Bondi-type regime where gas pressure is balanced by the gravity of a central star and an outer Jeans-type regime where gas pressure is balanced by gas self-gravity. The gas density profile provided by this model makes a smooth transition from a wind-type inner solution to a Bonnor-Ebert type outer solution. It is shown that high-velocity dust impinging on this cloud will tend to pile-up due to having a different velocity profile than gas so that the dust-to-gas ratio is substantially enriched above the 1% ISM level.
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