Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..32..139h&link_type=abstract
Astrophysics and Space Science, vol. 32, Jan. 1975, p. 139-151. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Milky Way Galaxy, Orbit Calculation, Stellar Motions, Astrodynamics, Celestial Mechanics, Computerized Simulation, Oort Cloud, Orbit Perturbation
Scientific paper
The orbits of over 10,000 stars are integrated in a steady-state model of the Galaxy for a time of 600 million years. Initially, the stars are placed randomly inside spheres of 500 pc and 50 pc radius and are given random velocities, such that the sample has a Maxwellian or a spheroidal velocity distribution. The spheres are placed at the sun's distance from the galactic centre (10 kpc) and are given a circular velocity of 250 km per sec. The mean velocities and dispersions of stars within 1 kpc of an 'observer' moving at the circular velocity are calculated as functions of time. The quantities show a strong time-dependence with oscillations of period 100 million years. The oscillations are independent of the mass model and occur also in an inverse square force field. A vertex deviation of the velocity ellipsoid, an asymmetric drift and a K-effect occur as natural consequences of the oscillations. Attempts to apply the Oort method for density determinations in the galactic plane are also influenced by the oscillations. Spiral density waves appear to have a small effect on the motions of the test stars.
House F. C.
Innanen Kimmo A.
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