# Shocked Self-similar Collapses and Flows in Star Formation Processes

@article{Shen2004ShockedSC, title={Shocked Self-similar Collapses and Flows in Star Formation Processes}, author={Yue Shen and Yu-qing Lou}, journal={The Astrophysical Journal Letters}, year={2004}, volume={611}, pages={L117 - L120} }

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-3/2 (a free-fall state…

## 9 Citations

Self-similar shocks in polytropic gas flows around star-forming regions

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- 2006

Self-similar shock solutions in spherically symmetric polytropic gas flows are constructed and analysed in contexts of protostar formation processes. Among other possible solutions, we model a…

Spherical isothermal self-similar shock flows

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We explore self-similar dynamical processes in a spherical isothermal self-gravitational fluid with an emphasis on shocks and outline astrophysical applications of such shock solutions. The previous…

Self‐similar polytropic champagne flows in H ii regions

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- 2008

We explore large-scale hydrodynamics of H II regions for various self-similar shock flows of a polytropic gas cloud under self-gravity and with quasi-spherical symmetry. We formulate cloud dynamics…

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We present numerical hydrodynamic simulations of the formation, evolution, and gravitational collapse of isothermal molecular cloud cores in spherical geometry. A compressive wave is set up in a…

Envelope expansion with core collapse - III. Similarity isothermal shocks in a magnetofluid

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- 2006

We explore magnetohydrodynamic (MHD) solutions for envelope expansions with core collapse (EECC) with isothermal MHD shocks in a quasi-spherical symmetry, and outline potential astrophysical…

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- 2008

A theoretical model framework of spherical symmetry is presented for a composite astrophysical system of two polytropic fluids coupled together by gravity to explore large-scale shocks and flow…

New self-similar solutions of polytropic gas dynamics

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- 2006

We explore semicomplete self-similar solutions for the polytropic gas dynamics involving self-gravity under spherical symmetry, examine behaviours of the sonic critical curve and present new…

Outflows and Inflows in Astrophysical Systems

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- 2005

We seek for self-similar solutions describing the time-dependent evolution of self-gravity systems with either spherical symmetry or axisymmetric disk geometry. By assuming self-similar variable x ≡…

Dynamic voids surrounded by shocked conventional polytropic gas envelopes

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- 2011

With proper physical mechanisms of energy and momentum input from around the centre of a self-gravitating polytropic gas sphere, a central spherical ‘void’ or ‘cavity’ or ‘bubble’ of very much less…

Self-similar dynamics of a relativistically hot gas

- Physics
- 2007

In the presence of self-gravity, we investigate the self-similar dynamics of a relativistically hot gas with or without shocks in astrophysical processes of stellar core collapse, formation of…