morphology of Horizontal Branch one obtains — in the frame of present knowledge of star-evolution —a suggestion for accepting high helium content ( Y -0.30) with a relatively small age (1–2×10 9 yr) for the evolving stars.Some correlations among lifetimes of evolutionaries stages are ...
The E-AGB stage of S-stars in the Magellanic Clouds is confirmed by a comparison of effective temperature distributions of S- and N-stars and theoretical distributions of stars in E-AGB and TP-AGB stages. 展开 年份: 1988 收藏 引用 批量引用 报错 分享 ...
The effects of mass loss on the final evolutionary stages of stars producing white dwarfs is also discussed. In particular, the interaction of the wind from the hot central star with the surrounding planetary nebula is considered. Finally, the problem of the origin of hydrogen-deficient stars is...
The effects of mass loss on the final evolutionary stages of stars producing white dwarfs is also discussed. In particular, the interaction of the wind from the hot central star with the surrounding planetary nebula is considered. Finally, the problem of the origin of hydrogen-deficient stars is...
<italic>Aims.</italic> Massive stars form in clusters, and they are often found in different evolutionary stages located close to each other. To understand evolutionary and environmental effects during the formation of high-mass stars, we observed three
根据文章第二段第一句“Stars,like individuals,age and change.As we look out into space,we see around us stars at all stages of evolution”,第三段首句“That yellow“hump”will shift as the Sun evolves…”和文章所述内容可推断本文主题是“太阳进化过程”。选项B.The evolutionary cycle of the ...
The excitation mechanisms and evolutionary stages of UWISH2 planetary nebula candidates 来自 国家科技图书文献中心 喜欢 0 阅读量: 16 作者:AM Jones,TM Gledhill,D Froebrich,MD Smith 摘要: We present medium-resolution K-band long-slit spectroscopy of 29 true, likely, possible, and candidate ...
Convergent or "Developmental" processes that attract, constrain, and guide the system through hierarchical stages of form and function. When we observe them from within any autopoetic system, these processes grow increasingly predictable over time. "Evo-Devo" processes that are Replicative, with Inher...
This likely reflects the ongoing molting cycles, with their cyclical upregulation of chitin metabolism and cuticular gene synthesis [40], that are experienced by the different instars and molt cycle stages of individuals pooled in this sample. Lastly, gene sets with sex-specific enrichment across...
A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL surveystars: formationstars: pre-main sequenceWe present a first study of the star-forming compact dust condensations revealed by Herschel in the two 2 imes 2 \\degr Galactic Plane fields centered ...