Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..263w&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 2, Sept. 1977, p. 263-275.
Astronomy and Astrophysics
Astrophysics
449
Diffusion Coefficient, Orbital Mechanics, Stellar Evolution, Stellar Motions, Stellar Orbits, Velocity Distribution, Age Factor, Galactic Structure, Gravitational Fields, Stellar Models
Scientific paper
Dispersions of observed stellar space velocities with age of stellar objects, diffusion in velocity space, an epicyclic diffusion approximation for an axisymmetric galactic field, and enhanced dissolution of stellar groups by diffusion of stellar orbits are discussed. Local fluctuations of the gravitational field in a galaxy are invoked to account for the observed increase of the dispersion of stellar space velocities with age. Determination of stellar birth places is rendered more difficult by the diffusion of orbits. A significant stochastic component of the galactic gravitational field, implications of the resulting field for stellar orbits and for retrodictions of sites of star formation, and coherence of the irregular field over small distances, are considered.
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