The fate of wide binaries in the solar neighborhood Encounters with stars and molecular clouds

Details The fate of wide binaries in the solar neighborhood Encounters with stars and molecular clouds The fate of wide binaries in the solar neighborhood Encounters with stars and molecular clouds

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...65...27w&link_type=abstract

Icarus (ISSN 0019-1035), vol. 65, Jan. 1986, p. 27-36.

Statistics

Computation

14

Binary Stars, Gravitational Effects, Molecular Clouds, Solar System, Stellar Evolution, Computational Astrophysics, Encounters, Fokker-Planck Equation, Monte Carlo Method, Nemesis (Star), Probability Theory, Run Time (Computers), Stochastic Processes, Temporal Distribution

Scientific paper

A hybrid Monte Carlo scheme is used to calculate the evolution of wide binaries by stochastic encounters with field stars and molecular clouds in the sun's vicinity. Distant encounters are computed using a Fokker-Planck analysis, close-encounter effects are treated individually. This approach enables the evolution to be computed for an extensive range of initial semimajor axes (alpha0) and environmental parameters. The probability that a binary has achieved a new semimajor axis for several values of alpha0, for several characteristic times is presented together with the probability of survival as a function of time for alpha0 between 0.01 and 1 pc. The first probability indicates the evolution of binary distribution, while the second provides a semimajor axis cutoff which may be compared with observations. The lifetime and stability of the proposed solar companion are considered in order to examine the sensitivity of these simulations to assumptions about the solar environment. Key quantities are scaled and compared with these simulations. The hybrid simulations were found to reveal two physical effects not taken into account by the scaling relations.

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