Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....65..393v&link_type=abstract
Astronomy and Astrophysics, vol. 65, no. 3, May 1978, p. 393-400.
Astronomy and Astrophysics
Astrophysics
Critical Mass, Gravitational Collapse, Interstellar Gas, Rotating Matter, Stellar Evolution, Angular Velocity, Condensing, Equilibrium, Polytropic Processes, Stellar Mass Accretion, Thermodynamics
Scientific paper
The influence of a uniform rotation upon the equilibrium conditions of a self-gravitating interstellar cloud is examined. The equation of state is assumed to be that of polytrope with negative index and the cloud is acted upon by an external pressure. For a given angular velocity, equilibrium is possible only when the external pressure falls between two critical values: these limits approach each other with increase of mass and no equilibrium is possible beyond a critical mass which, for example, is of the order of 800 solar masses, when the angular velocity is 10 to the -15th/sec. A quasi-static analysis of the evolution of a cloud having constant angular momentum shows that the centrifugal forces in the equatorial plane are such that the pressure sometimes does not reach its critical value for collapse.
Bel N.
Bonazzola Silvano
Viala Yves
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