N-body simulations of tidal encounters between stellar systems |
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| Authors: | P Devadas Rao N Ramamani Saleh Mohammed Alladin |
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| Institution: | (1) Centre of Advanced Study in Astronomy, Osmania University, 500007 Hyderabad;(2) International Centre for Theoretical Physics, 34100 Trieste, Italy;(3) Present address: Department of Mathematics, M.G.M. College, Udupi;(4) Present address: Centre of Advanced Study in Astronomy, Osmania University, 500007 Hyderabad |
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| Abstract: | N-Body simulations have been performed to study the tidal effects of a primary stellar system on a secondary stellar system
of density close to the Roche density. Two hyperbolic, one parabolic and one elliptic encounters have been simulated. The
changes in energy, angular momentum, mass distribution, and shape of the secondary system have been determined in each case.
The inner region containing about 40 per cent of the mass was found to be practically unchanged and the mass exterior to the
tidal radius was found to escape. The intermediate region showed tidal distension. The thickness of this region decreased
as we went from hyperbolic encounters to the elliptic encounter keeping the distance of closest approach constant. The numerical
results for the fractional change in energy have been compared with the predictions of the available analytic formulae and
the usefulness and limitations of the formulae have been discussed. |
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| Keywords: | stellar systems tidal encounters— stellar dynamics |
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