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星系的化学演化
释义
星系的化学演化
Encyclopedia
理学
星系
释
chemical evolution of galaxies
星系的化学演化
星系中恒星和星际物质的元素丰度随时间的变化过程。这类研究开始于1963年M.施米特的一篇论文,该文的主要目的是要对星系中恒星和星际物质观测到的化学元素丰度给予合理的说明。此外,将观测结果同理论预言比较还可对恒星形成和演化的理论提供重要约束。
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product of numbers
product of objects
product of operators
product of ordinal numbers
product of paths
product of permutation groups
product of points
product of polynomials
product of potencies
product of relations
product of representations
product of residue classes
product of rings
product of sets
product of spaces
product of spheres
product of subgroups
product of tensors
product of transformations
product of translation
product of vectors
product of σ-rings
product operation
product order
product orientation
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