Gravitational collapse of cosmic gas clouds and formation of star clusters |
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| Authors: | B Basu Tara Bhattacharyya |
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| Institution: | (1) Department of Applied Mathematics, Calcutta University, India;(2) Jogamaya Devi College, Calcutta, India |
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| Abstract: | In this paper the gravitational collapse of cosmic gas clouds and formation of star clusters has been considered. Hoyle's view of successive fragmentation has been taken as the basic mechanim in the present work. The initial masses of protostars have been estimated as the function of their distances from the centre of the cluster and the intensity of the magnetic field of the medium. It has been shown that the fragmentation process is greatly inhibited by the presence of a strong magnetic field. A model has been constructed showing how a protostar grows in mass by accretion from the surrounding medium, on the basis of the assumption that as the star moves at random in the cluster it picks up a fraction of the material through which it passes. It has been estimated that a protostar of initial mass of about 0.1M
 grows to one of 1.0M
in a time period which ranges from a few multiples of 105 to a few multiples of 107 yr, depending on the parameters involved in the accretion process. The number of stars per unit mass range has also been estimated; it is found to be proportional tom
–3.3,m being the mass of the star. |
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