Cometary globules. 1: Formation, evolution and morphology

Details Cometary globules. 1: Formation, evolution and morphology Cometary globules. 1: Formation, evolution and morphology

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..559l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 2, p. 559-578

Astronomy and Astrophysics

Astrophysics

173

Cometary Atmospheres, Evolution (Development), Globules, Hydrodynamics, Interstellar Matter, Morphology, Astronomical Models, Gravitation, H Ii Regions, Ionization, Ionizing Radiation, Simulation, Stability

Scientific paper

We study the dynamical evolution of a neutral globule illuminated by the ionizing radiation of OB stars. We can reproduce the main morphological and dynamical properties of cometary globles (CGs), which are rather insensitive to initial and boundary conditions. We present results of 2-d hydrodynamical simulations of the evolution of cometary globules. We present a detailed evolutionary sequence from the cloud's collapse to the quasi-stationary comtary regime. This latter phase lasts approxmately 90% of the cloud's lifetimes. From the results of the simulations, we generate maps of emissions measure, projected density and position-velocity diagrams, which can be confronted to optical to molecular line observations. The maps of emission measure exhibit a striking resemblance to various types of CGs and other bright-rimmed strucures found in HII regions. A simple analytic model parallels and extend our simulations, including non-thermal pressure support. We derive criteria for the stabilty of the ionization front in the cemtary phase and illustrate them with results from the simulations. We also study the gravitational statiblity of CGs; we find that they are stable and mainly supported by the magnetic field.

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