Conditions of persistence for old stellar groups

Details Conditions of persistence for old stellar groups Conditions of persistence for old stellar groups

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..341g&link_type=abstract

Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 341-346. Research supported by the Schweizerischer Nationalfonds zur

Astronomy and Astrophysics

Astrophysics

1

Astronomical Models, Celestial Mechanics, Star Distribution, Stellar Motions, Astrophysics, Numerical Integration, Orbit Calculation, Stellar Evolution

Scientific paper

The proposition given by Innanen and House (1970) to explain the persistence of old stellar groups in terms of successive close mutual approaches of stars having a common origin is tested systematically by numerical integration of orbits in Schmidt's (1965) potential. The method of the surface of a section is used to distinguish among the various types of orbits: tube, box, semiergodic. The conditions for the persistence of approaches are very restrictive; the dispersion of energy and angular momentum among the stars of a group must be very small, and close approaches are present only for particular initial conditions associated with the 'third' integral of motion. Observed old groups do not fulfill these conditions.

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