Concentrations of the Interstellar Medium.
1946; IOP Publishing; Volume: 104; Linguagem: Inglês
10.1086/144829
ISSN1538-4357
Autores Tópico(s)Astrophysics and Star Formation Studies
Resumoview Abstract Citations (28) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Concentrations of the Interstellar Medium. Whipple, Fred L. Abstract A suggested process for the origtn of stars by the concentration of interstellar dust particles is dis- cussed. In the initial stages the process depends upon the mutual attraction of particles under th~ force of light-pressure in the galactic-radiation field, as proposed by Spitzer. A chance concentration of parti- cles will become an attractive center of force and will grow exponentially with time, as particles percolate through the gaseous substratum. Only in the darkest obscuring clouds, away from hot bright stars, i~ the theoretical growth found to be sufficiently rapid for serious consideration. After the initial concentration has become moderately opaque, the growth is linear with time, until a sufficient mass has accumulated for gravity to become effective. Then a much slower exponential growth with time can complete the prestellar accumulation of mass, if the interstellar medium is sufficiently quiescent. The conditions of quiescence are found to be exceedingly severe. If these conditions can be satisfied in actual obscuring clouds, stars can evolve from interstellar matter in a space of time of the order of~ 1O~ years. Galactic clusters ofstars would generally be expected rather than individual isolated stars. Various observational evidence points to the likelihood of some such evolutionary process Publication: The Astrophysical Journal Pub Date: July 1946 DOI: 10.1086/144829 Bibcode: 1946ApJ...104....1W full text sources ADS |
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