Dynamical capture of field stars by interstellar clouds

Details Dynamical capture of field stars by interstellar clouds Dynamical capture of field stars by interstellar clouds

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245...75w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 75-78. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

1

Gravitational Collapse, Interstellar Matter, Molecular Clouds, Star Clusters, Stellar Motions, Astronomical Models, Kinematics, Stellar Evolution, Time Dependence

Scientific paper

Evidence suggesting the existence of old stars in young galactic clusters, has motivated an investigation of a model in which such stars are captured from the field during the gas cloud collapse phase of star formation. A hyperbolic field star cannot be gravitationally captured by a static cloud since the star's total energy is conserved. However, if the cloud's potential is an explicit function of time, the energy of a penetrating star can be decreased. As a first step in modeling the dynamical capture of field stars, capture by freely falling, homogeneous spherical cloud is considered. This simplified model is solved, and a prediction is obtained for number of captured field stars in terms of the cloud parameters and dispersion velocities of the field stars.

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