Titlebook: Selected Exercises in Galactic Astronomy; I. Atanasijevi? Book 1971 D. Reidel Publishing Company, Dordrecht, Holland 1971 astronomy

WAX

fibroblast

The Theory of Galactic Rotation,hat the greater galactic system… may be divided up into sub-systems each of which is symmetrical around the axis of symmetry of the greater system and each of which is approximately in a state of dynamical equilibrium. The sub-systems rotate around their common axis, but each one has a different speed of rotation.

Commission

The Determination of the Galactic Orbit of a Star,focus our attention on the individual rather than on a large community of stars. In fact we shall show how the galactic orbit of a star can be computed and propose to the reader that he should determine the orbit of a real star.

Axon895

Determination of the Position of the Galactic Equator,inates especially appropriate for the study of the distribution and motions of objects belonging to our stellar system. For obvious reasons the plane of symmetry will be adopted as the fundamental plane of this coordinate system.

一大塊

CERE

Determination of the Vertex of the Hyades Cluster,ow a very conspicuous convergent character. Moreover they are of the same order of magnitude (Figure III.l). This has long ago been explained by assuming that all the cluster members are moving with equal velocities. The point on the celestial sphere towards which the total proper motions are direct

Organonitrile

Solar Motion and Velocity Distribution of a Group of Stars,ple — represents rather an exception than the rule. In fact, if we take an arbitrary point in space and consider all the stars contained in an astronomically small volume around this point, we shall find that they move in all directions and that the absolute values of their velocities scatter over a

花束

Fresco

The Theory of Galactic Rotation, milestone in the evolution of our ideas on the dynamics of the stellar system, Prof. J. H. Oort wrote:.Lindblad has recently put forward an extremely suggestive hypothesis, giving a beautiful explanation of the general character of the systematic motions of the stars of high velocity. He supposes t

銼屑

The Determination of the Galactic Orbit of a Star,ither case the emphasis has been on the statistical point of view and, so far as the problems of motion are concerned, it is only the kinematical aspect which has been covered. This last exercise will be devoted to a problem in stellar dynamics. Moreover we shall radically change our standpoint and