Shocked self-similar collapses and flows in star formation processes

Yue Shen, Yu Qing Lou

Research output: Contribution to journalArticlepeer-review


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); (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-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.

Original languageEnglish (US)
Pages (from-to)L117-L120
JournalAstrophysical Journal
Issue number2 II
StatePublished - Aug 20 2004
Externally publishedYes


  • H II regions
  • Hydrodynamics
  • ISM: clouds
  • Shock waves
  • Stars: formation
  • Stars: winds, outflows

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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