farewell
发表于 2025-3-25 04:51:43
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
发表于 2025-3-25 11:04:00
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MAPLE
发表于 2025-3-25 14:32:59
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.
affluent
发表于 2025-3-25 16:08:51
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BIAS
发表于 2025-3-25 20:26:02
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Silent-Ischemia
发表于 2025-3-26 04:07:23
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纵火
发表于 2025-3-26 05:32:43
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
发表于 2025-3-26 11:11:05
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.
压迫
发表于 2025-3-26 16:10:18
Astrophysics and Space Science Libraryhttp://image.papertrans.cn/b/image/188862.jpg
FUME
发表于 2025-3-26 20:45:38
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.