Astrophysik IV Sternsysteme / Astrophysics IV Stellar Systems [Paperback]

Kinematical Basis of Galactic Dynamics.- I. General features of observed stellar motions.- II. Kinematical considerations.- Galactic Dynamics.- I. Introduction.- II. Mass motions and velocity distribution in the gravitational field of the Galaxy.- III. Velocity distribution from statistics of differential orbital motions.- IV. The dispersion of stellar velocities as function of the time.- V. The problem of spiral structure and problems concerning the evolution of the system.- General references.- Radio-frequency Studies of Galactic Structure.- 1. General surveys.- 2. Units.- 3. Origin of radiation.- 4. Thermal emission.- 5. Synchrotron radiation.- 6. Line emission.- 7. Distribution of neutral hydrogen. Spiral structure.- 8. Galactic rotation from observations.- 9. Distribution of ionized hydrogen.- 10. General radiation from the region close to the galactic plane.- 11. Corona of radio emission around the Galactic System.- General references.- Star Clusters.- A. Introduction.- B. Galactic clusters.- I. Appearance and apparent distribution.- II. Methods of distance determination.- III. Stellar content.- IV. Color and spectrum luminosity diagrams, evolution and ages.- V. Motions of stars.- VI. Some well-known clusters.- a) Pleiades.- b) Praesepe.- c) Coma Berenices.- d) The double cluster in Perseus, h and ? Persei.- e) Messier 11.- f) Messier 67.- g) x Crucis, the Jewel Box.- VII. Moving clusters.- VIII. Disruption with time.- IX. Nebulous and very young clusters.- X. Stellar associations.- C. Globular clusters.- I. Appearance and apparent distribution.- II. Distance determinations.- III. Content of globular clusters.- IV. Motions.- V. Masses and densities.- VI. Evolution, age and origin.- VII. Relation to elliptical galaxies.- VIII. Clusters associated with extragalactic systems.- Appendix A. Catalogue of galactic clusters.- Appendix B. Catalogue of globular clusters.- General references.- Discrete Sources of Cosmic Radio Waves.- A. Definitions and units.- B. TechniqlSW