Interaction between a high-velocity star and a hot dense cloud |
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| Authors: | L. Nicolaci Da Costa B. A. Fryxell |
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| Affiliation: | (1) Department of Physics, Harvard University, Cambridge, Mass., U.S.A.;(2) Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., U.S.A.;(3) Present address: Observatorio Nacional, Rua General Bruce 586, 20921 Rio De Janeiro R.J., Brazil;(4) Present address: Lick Observatory, University of California, Santa Cruz, U.S.A. |
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| Abstract: | In order to investigate the fate of a high-velocity star confined to a massive gas cloud, the hydrodynamic behavior of a radiation-dominated flow past a finite-size gravitating object is calculated. Such a study is important in the context of quasars and active galactic nuclei, since large gas clouds have been suggested to be associated with the phenomena occurring in these systems. In particular, we study the processes of mass and energy exchange between the ambient gas and the star. A significant result is that the effective accretion cross-section is found to be a substantial fraction of the stellar geometrical cross-section. Consequently, the buildup of massive stars via accretion of the surrouding gas may be important in determining the evolution of the system of stars confined to the cloud. |
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