Titlebook: Birth and Evolution of Massive Stars and Stellar Groups; Proceedings of a Sym Wilfried Boland,Hugo Woerden Conference proceedings 1985 D. R

farewell

Distribution and Motion of Young Nearby Stars as a Function of Age distances coinciding with a discontinuity in the velocity gradients. Table 1 gives velocity parameters for different age groups, and the difficulty to find simple models to explain the expanding motion of the local group of young stars is discussed.

hyperuricemia

MAPLE

The Structure of Star-Forming Regions-The Ages of Subgroups and the Progression of Star Formationo the few hundredths of a parsec structure observed in dense cloud cores. Explanations of both the temporal and spatial progress of star formation are reviewed, and factors which may dominate the process on all scales are considered.

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BIAS

Silent-Ischemia

縱火

Double Stars in Young Stellar Groupsith other investigations. Along the entire main sequence (O-K5) close binaries appear to form with nearly circular orbits. When the orbital dimensions are close to the stellar dimensions complete circularization takes place.

Scintigraphy

Photometric Age Determination of OB-Associationse determination of ages of the associations and their subgroups by means of isochrone fitting are investigated. The influence of stellar rotation and undetected duplicity is discussed. Future work on the stellar content of the nearby OB-associations is suggested, in connection with the . mission.

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Astrophysics and Space Science Libraryhttp://image.papertrans.cn/b/image/188862.jpg

FUME

Lehrbuch der Chemie und MineralogieThe recognition of stellar associations as regions of star formation, i.e. regions containing groups of recently formed stars (Ambartsumian 1947), had an important significance for our understanding of the origin and evolution of stars.