Cold clouds and interstellar grains

Details Cold clouds and interstellar grains Cold clouds and interstellar grains

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mmsai..47..125b&link_type=abstract

(Società Astronomica Italiana, Riunione, 19th, Lecce, Italy, Oct. 3-5, 1975.) Società Astronomica Italiana, Memorie, vol. 47, Ju

Astronomy and Astrophysics

Astronomy

Chemical Composition, Infrared Astronomy, Interstellar Gas, Interstellar Matter, Radio Astronomy, Stellar Evolution, Ammonia, Carbon Monoxide, Early Stars, Electron Density (Concentration), Formaldehyde, Gas Density, Gas Temperature, H Ii Regions, Hydrogen Atoms, Hydroxyl Radicals, Interstellar Magnetic Fields, Milky Way Galaxy

Scientific paper

Radio-wave and IR evidence on dust-rich gas-rich cold clouds found in the galactic plane is reviewed, and a tentative evolutionary sequence is advanced. The clouds are held in place by gravitational forces, and their masses are commensurate with those of young clusters formed of young stars. A time scale is derived from molecular spectral lines (H2, HD, OH); densities and possible collapse rate are also inferred. The sequence: condensation/cold dust cloud/formation of molecules/freezing and collapse/formation of low-mass stars/formation of O type stars/formation of H II regions/cessation of stellar formation is proposed.

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