核时标 Nuclear timescale
核时标是在天文物理学中纯粹基余核燃料消耗速率估计的恒星寿命。如果假设的条件能够满足,热和力学时标是用来估计个别恒星处在生命阶段的哪一个时期,和恒星寿命的某一个阶段。实际上,恒星的寿命会大于原子核时标估计的,因为当一种燃料变得缺乏时,另一种常常会取而代之-氢燃烧成氦、氦会再燃烧等等。但是,在氢燃烧之后所有阶段总合在一起的时间通常仍短于氢燃烧期间的10%。
单词 | Nuclear lifetime |
释义 |
Nuclear lifetime
中文百科
核时标 Nuclear timescale(重定向自Nuclear lifetime)
核时标是在天文物理学中纯粹基余核燃料消耗速率估计的恒星寿命。如果假设的条件能够满足,热和力学时标是用来估计个别恒星处在生命阶段的哪一个时期,和恒星寿命的某一个阶段。实际上,恒星的寿命会大于原子核时标估计的,因为当一种燃料变得缺乏时,另一种常常会取而代之-氢燃烧成氦、氦会再燃烧等等。但是,在氢燃烧之后所有阶段总合在一起的时间通常仍短于氢燃烧期间的10%。
英语百科
Nuclear timescale 核时标(重定向自Nuclear lifetime)
In astrophysics, the nuclear timescale is an estimate of the lifetime of a star based solely on its rate of fuel consumption. Along with the thermal and dynamical time scales, it is used to estimate the length of time a particular star will remain in a certain phase of its life and its lifespan if hypothetical conditions are met. In reality, the lifespan of a star is greater than what is estimated by the nuclear time scale because as one fuel becomes scarce, another will generally take its place—hydrogen burning gives way to helium burning, etc. However, all the phases after hydrogen burning combined typically add up to less than 10% of the duration of hydrogen burning. |
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