Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...41..433d&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 41, Sept. 1980, p. 433-436.
Astronomy and Astrophysics
Astrophysics
4
Statistical Analysis, Stellar Motions, Astronomical Coordinates, Inhomogeneity
Scientific paper
The dispersion of the velocity components of 726 nearby stars along a direction approximately perpendicular to the Cygnus branch of the local spiral arm is investigated. The averages and standard deviations of stellar velocities in this direction are calculated on the basis of U and V components and parallaxes given in the Catalog of Nearby Stars for the whole population of stars and for samples grouped according to their galactic longitudes. The variances among groups are found to be inhomogeneous in several partitions, with inhomogeneities most significant in those partitions including the direction l equals 60 deg as a dividing line. The cases of inhomogeneity are attributed to minimal standard deviations. In addition, it is found that as stellar paths become more perpendicular to the Cygnus branch, the dispersion inhomogeneity becomes greater and the dispersion decreases.
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