Abstract
The author calculates the gradients of the ellipsoid of the residual velocities in the galactic plane and in the directions of the galactic-center and of rotation. The calculations concern various age groups of stars for which the distances are limited to 200 pc. The author uses the maximum likelihood method to solve the proper motions and radial velocity equations. The resulting system of nonlinear equations is solved by application of the Monte-Carlo method. For samples of stars with ages between 250 and 800 million years for which the vertex deviation is maximum the author notes significant variations of the velocity ellipsoid. The study of the lines of equal vertex deviations reveals for stars in the solar neighborhood a local structure in the longitude direction 45°–225°.
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© 1984 Springer-Verlag Berlin Heidelberg
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Böhme, S. et al. (1984). Stars. In: Böhme, S., et al. Astronomy and Astrophysics Abstracts. Astronomy and Astrophysics Abstracts, vol 34. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-12340-9_13
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DOI: https://doi.org/10.1007/978-3-662-12340-9_13
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-662-12342-3
Online ISBN: 978-3-662-12340-9
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