Shocked similarity collapses and flows in star formation processes

Abstract

We propose self-similar shocked flow models for certain dynamical evolution phases of young stellar objects (YSOs), `champagne flows' of H {\sevenrm II} regions surrounding OB stars and shaping processes of planetary nebulae (PNe). We analyze an isothermal fluid of spherical symmetry and construct families of similarity shocked flow solutions featured by: 1. either a core expansion with a finite central density or a core accretion at constant rate with a density scaling $\propto r^{-3/2}$; 2. a shock moving outward at a constant speed; 3. a preshock gas approaching a constant speed at large $r$ with a density scaling $\propto r^{-2}$. In addition to testing numerical codes, our models can accommodate diverse shocked flows with or without a core collapse or outflow and an envelope expansion or contraction. As an application, we introduce our model analysis to observations of Bok globule B335.

ApJL accepted

References in corpus (4)

• Self-similar champagne flows in HII regions
• Structure of Protostellar Collapse Candidate B335 Derived from Near-Infrared Extinction Maps
• Disk Properties and Density Structure of the Star-Forming Dense Core B335
• Envelope Expansion with Core Collapse. I. Spherical Isothermal Similarity Solutions

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