Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..743b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 15, 1986, p. 743-760.
Astronomy and Astrophysics
Astronomy
65
Accretion Disks, Disk Galaxies, Galactic Evolution, Galactic Structure, Spheroids, Angular Momentum, Axes Of Rotation, Distribution Functions, Orbital Elements, Solar System, Star Distribution, Stellar Orbits
Scientific paper
On the basis of the likelihood that disk galaxies originated as undressed spheroids, gradually forming over several billion years, it is shown that most spheroid stars are probably on nonresonant orbits and that the actions characterizing such orbits are virtually invariant when a massive disk is slowly inserted into the spheroid. If the protodisk material had an initial angular momentum that was not parallel to the spheroid's minor axis, the spheroid will have slewed as the disk formed, in the fashion of a rigid body. An investigation of systems with well defined distribution function that are confined by flattened Staeckel potentials clarifies the current large scale structure of the classic metal-poor populations of the solar neighborhood, and allows the structure of these populations prior to disk formation to be inferred. The velocity ellipsoids of these populations imply that they must now form flattened bodies.
Binney James
May Alana
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