Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203...75l&link_type=abstract
Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 1, p. 75-80.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Models, Dwarf Stars, Galactic Structure, Mass Distribution, Stellar Systems, Variable Stars, Velocity Distribution, Eddington Approximation, Eigenvalues, Galactic Rotation, M Stars, Stellar Mass
Scientific paper
Implications of the hypothesis that the halo is the major contributor to the Galaxy's interior mass are worked out and compared with observations. The required local density of halo stars is found to be about 0.007 solar mass per cu pc, and this is shown not to be inconsistent with the observational data. Eddington's (1915) model for spherical stellar systems, in which the velocity distribution is everywhere ellipsoidal, is argued to be an acceptable model for the halo and is used to explore the consequences of the halo's being an approximately self-gravitating system. When the parameters of the model are determined from the observed velocity dispersions of local halo stars, it predicts a mass distribution that corresponds to a rotation curve agreeing closely with the Galaxy's, except in the nuclear regions. With a truncated velocity distribution, the model is also used to investigate the exterior structure of the halo. A significant increase in the Galaxy's total mass is found if the total space motions of local halo stars extend to about 425 km/s.
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