Stellar oscillations triggered by close encounters

Details Stellar oscillations triggered by close encounters Stellar oscillations triggered by close encounters

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9..424k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 9, July-Aug. 1983, p. 424-431) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, July-

Astronomy and Astrophysics

Astronomy

2

Celestial Mechanics, Stellar Motions, Stellar Oscillations, Tides, Orbital Mechanics, Polytropic Processes, Solar Oscillations, Traveling Waves

Scientific paper

The oscillations arising at close encounters of stars are considered with the aid of numerical methods in linear adiabatic approximations. It is shown that two types of oscillatory motions appear due to the action of tidal forces. The first is a normal mode described by the spherical harmonic of degree l = 2 and of order m = 0. The second more important type of oscillation, with a several times higher amplitude (l = 2, |m| = 2) is a running wave, propagating in the direction of parabolic motion of the disturbing star. It is suggested that the 160-min oscillations of the sun can be a relict phenomenon of encounter of the sun with a low-mass star or a cloud at the earlier stage of solar evolution. It is also pointed out that the oscillations arising at close encounters are very similar to those of β Cephei stars.

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