Gaussian components of velocity distributions of giant stars

Details Gaussian components of velocity distributions of giant stars Gaussian components of velocity distributions of giant stars

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasp...87..737d&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 87, Oct. 1975, p. 737-743.

Astronomy and Astrophysics

Astronomy

9

Giant Stars, Normal Density Functions, Space Density, Stellar Motions, Velocity Distribution, Astronomical Models, Galactic Structure, Late Stars, Milky Way Galaxy, Oort Cloud, Star Distribution

Scientific paper

An investigation of the velocity distribution of giant stars perpendicular to the galactic plane has been made using a new determination of their space densities in the region of the north galactic pole. These densities, together with the K(z) force as determined by Oort, give rise to a total velocity distribution which is well represented by three Gaussian distributions. A stable and realistic model is achieved with no constraints imposed upon the parameters of each velocity distribution. The relative abundances and mean velocities of the distributions differ markedly from Oort's results; in particular, his conclusion that a small component of stars of very high velocity is necessary to satisfy the density requirements is not supported here. It is concluded that his values of K(z) cannot be reconciled with his distributions, but many more radial velocities of high-latitude giant stars are needed to identify the cause of the discrepancy.

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