Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89..296s&link_type=abstract
Astronomy and Astrophysics, vol. 89, no. 3, Sept. 1980, p. 296-307.
Astronomy and Astrophysics
Astrophysics
68
Astronomical Models, Computerized Simulation, Galactic Structure, Angular Momentum, Approximation, Galactic Evolution, Galactic Mass, Halos, Momentum Transfer
Scientific paper
Computer models of galaxies are described, in which the disk stars and the halo stars are both treated fully self consistently. These were used to test the validity of the 'rigid halo' approximation usually employed when studying the instabilities of a disk of stars. The models show that very little interaction between the populations occurs while the disk remains nearly axisymmetric, but a strong bar is able to transfer angular momentum from the disk to the halo. The global bar stability of the disk is not greatly affected by the interaction between the two stellar populations, and it is found that a large fraction of the total galactic mass is still required in the spheroidal component if bar formation is to be prevented.
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