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	Dynamic evolution model of isothermal voids and shocks
	Lou, Yu-Qing ; Zhai, Xiang
	2010-10-12 ; 2010-10-12
关键词	H II regions Hydrodynamics ISM: bubbles ISM: clouds Planetary nebulae Supernova remnants GRAVITATING GASEOUS SPHERES SELF-SIMILAR SOLUTIONS H-II REGIONS PLANETARY-NEBULAE SUPERNOVA REMNANT POLYTROPIC GAS ROSETTE NEBULA CORE-COLLAPSE INTERSTELLAR BUBBLES SIMILARITY SOLUTIONS Astronomy & Astrophysics
中文摘要	We explore self-similar hydrodynamic evolution of central voids embedded in an isothermal gas of spherical symmetry under the self-gravity. More specifically, we study voids expanding at constant radial speeds in an isothermal gas and construct all types of possible void solutions without or with shocks in surrounding envelopes. We examine properties of void boundaries and outer envelopes. Voids without shocks are all bounded by overdense shells and either inflows or outflows in the outer envelope may occur. These solutions, referred to as type X void solutions, are further divided into subtypes XI and XII according to their characteristic behaviours across the sonic critical line (SCL). Void solutions with shocks in envelopes are referred to as type Z voids and can have both dense and quasi-smooth edges. Asymptotically, outflows, breezes, inflows, accretions and static outer envelopes may all surround such type Z voids. Both cases of constant and varying temperatures across isothermal shock fronts are analyzed; they are referred to as types ZI and ZII void shock solutions. We apply the 'phase net matching procedure' to construct various self-similar void solutions. We also present analysis on void generation mechanisms and describe several astrophysical applications. By including self-gravity, gas pressure and shocks, our isothermal self-similar void (ISSV) model is adaptable to various astrophysical systems such as planetary nebulae, hot bubbles and superbubbles in the interstellar medium as well as supernova remnants.
语种	英语 ; 英语
出版者	SPRINGER ; DORDRECHT ; VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/81451]
专题	清华大学
推荐引用方式 GB/T 7714	Lou, Yu-Qing,Zhai, Xiang. Dynamic evolution model of isothermal voids and shocks[J],2010, 2010.
APA	Lou, Yu-Qing,&Zhai, Xiang.(2010).Dynamic evolution model of isothermal voids and shocks..
MLA	Lou, Yu-Qing,et al."Dynamic evolution model of isothermal voids and shocks".(2010).

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