Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.129..261k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 129, no. 2, Jan. 1987, p. 261-269.
Astronomy and Astrophysics
Astrophysics
2
Cosmic Gases, Implosions, Molecular Clouds, Star Formation, Stellar Radiation, Astronomical Models, Gravitational Fields, H Ii Regions, Shock Waves, Star Clusters
Scientific paper
The evolution of the molecular gas cloud embedded in an H II region is studied. A spherical, uniform, and stable molecular gas cloud exposed to strong ionizing radiation from nearby massive stars is considered. The gas cloud is strongly compressed by the surrounding high-pressure ionized gas, and a shock wave is formed. The shock-compressed gas forms a shell which converges toward the center of the cloud, sweeping up the inner material. As the shell accumulates the swept-up gas, it becomes gravitationally unstable. The growth time of the instability is less than the time-scale of the whole collapse of the cloud. Thus, the shell will break into fragments before it reaches the center of the cloud, leading to formation of a stellar association or a cluster.
Kimura Toshiya
Tosa Makoto
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