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	Shocked self-similar collapses and flows in star formation processes
	Yue Shen ; Yu-Qing Lou
	2010-05-06 ; 2010-05-06
关键词	Theoretical or Mathematical/ accretion astrophysical fluid dynamics H II regions planetary nebulae pre-main-sequence stars shock waves star formation stellar winds/ shocked self-similar collapses shocked self-similar flow star formation processes shocked flow models dynamical evolution phases champagne flows young stellar object H II regions OB stars shaping processes planetary nebulae isothermal fluid stellar outflow Bok globule B335 accretion flow stellar wind breeze/ A9720D Pre-main-sequence stars A9730S Other types of variable and peculiar stars A9710B Star formation A9710H Mass transfer A9840M Planetary nebulae A9840L Star-forming regions A9840H H II regions, emission nebulae A9530L Astrophysical fluid dynamics
中文摘要	We propose self-similar shocked flow models for certain dynamical evolution phases of young stellar objects, "champagne flows" of H II regions surrounding OB stars, and shaping processes of planetary nebulae. We analyze an isothermal fluid of spherical symmetry and construct families of self-similar shocked flow solutions that feature (1) either a core expansion with a finite central density or a core accretion at a constant rate with a density scaling proportional to r /sup -3/2/ (a free-fall state); (2) a shock moving outward at a constant speed (a wind, a breeze, or an accretion flow); and (3) a preshock gas approaching a constant speed at large r with a density scaling proportional to r/sup -2/. In addition to testing numerical codes, our models can accommodate diverse shocked flows with or without a core collapse or outflow and with or without an envelope expansion or contraction. As an application, we introduce our model analysis to observations of Bok globule B335.
语种	英语 ; 英语
出版者	University of Chicago Press for American Astron. Soc ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15304]
专题	清华大学
推荐引用方式 GB/T 7714	Yue Shen,Yu-Qing Lou. Shocked self-similar collapses and flows in star formation processes[J],2010, 2010.
APA	Yue Shen,&Yu-Qing Lou.(2010).Shocked self-similar collapses and flows in star formation processes..
MLA	Yue Shen,et al."Shocked self-similar collapses and flows in star formation processes".(2010).

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