Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..217b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 217-233.
Astronomy and Astrophysics
Astrophysics
8
Gas Ionization, Globules, Molecular Clouds, Wave Fronts, Astrophysics, Elastic Waves, H Ii Regions, Hydrogen Atoms, Taylor Instability, Wave Propagation
Scientific paper
It is assumed that an H II region has evolved inside a molecular cloud. The interactions that result from the expanding shell of compressed molecular gas reaching the edge of the cloud are calculated, and the instability of the ionization front to the formation of globules is investigated. The rarefaction wave which is reflected from the contact discontinuity as the leading shock passes through the edge of the cloud accelerates the ionization front, and since conditions at the front satisfy Capriotti's criterion for instability, the shell breaks up. The size of the fragment so created is determined by the thickness of the compressed shell. If the shell phase of H II region evolution has proceeded significantly, then globules of up to a fraction of a solar mass may be formed in an H II region caused by a star with an ionizing luminosity of 10 to the 49th photons/sec in a molecular cloud of density 1000/cu cm. These globules may survive the ionizing flux from the star, and will be driven from the cloud by the rocket effect.
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