Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98...30w&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 30-33. Research supported by the Consiglio Nazionale delle Ricerche.
Astronomy and Astrophysics
Astrophysics
2
Celestial Mechanics, Comets, Companion Stars, Gravitational Effects, Nemesis (Star), Orbit Perturbation, Angular Momentum, Astronomical Models, Error Correcting Devices, Three Body Problem, Comets, Perturbations, Energy, Distribution, Mathematical Models, Data, Statistical Analysis
Scientific paper
Kirk (1978) argued that a companion star to the sun, suggested by Harrison (1977), cannot be excluded by means of the data on nearly parabolic comets, provided its speed is large enough. An exact calculation confirms Kirk's result. The encounter does not affect the mean energy of the comets. But their spread of energies is increased. If the mass, speed and present distance of the companion are held fixed, the amount of broadening is the largest for those encounters in which the two stars have approached closest. The extra spread in energy falls below the observed value when the companion's mass is small, or its speed and present distance are large. Discussion of the several approximations adopted shows that the results should be accurate at the 10% level under nominal values of the parameters.
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