File:Stellar evolution L vs T.png
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描述Stellar evolution L vs T.png |
This diagram shows the primary evolutionary stages of a solar-mass star. The axes are scaled to show the logarithm of the stellar Luminosity (L) versus the surface Temperature (T). In this diagram the Sun currently has a log(L) of zero and lies along the diagonal, main-sequence line. The star begins as a Bok globule (a) that contracts to form a condensing protostar. When it begins burning Hydrogen about 30 million years later, it stabilizes into a zero-age main sequence star. Thereafter it remains a main sequence star for about the next 10 billion years. The proportion of Helium at the core of this star steadily increases over this period, causing a gradual rise in luminosity. As the Hydrogen at the core becomes exhausted, the star blossoms into a massive red giant (b). The star increases in luminosity, burning Hydrogen in a shell around a degenerate Helium core. Finally the Helium flash triggers Helium fusion to begin at the core. One to two billion years after leaving the main sequence, the giant star now begins to experience a period of instability. The envelope is gently ejected (c), forming a planetary nebula and exposing the hot, compact core. Once Helium fusion has ceased, the star becomes a white dwarf (d) and slowly radiates away its remaining energy. |
日期 | |
来源 | After a diagram in Stars and Nebula by William J. Kaufmann, III.[1] |
作者 | Illustration by contributor. |
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Per license information. |
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已授权您依据自由软件基金会发行的无固定段落及封面封底文字(Invariant Sections, Front-Cover Texts, and Back-Cover Texts)的GNU自由文件许可协议1.2版或任意后续版本的条款,复制、传播和/或修改本文件。该协议的副本请见“GNU Free Documentation License”。http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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本许可协议标签作为GFDL许可协议更新的组成部分被添加至本文件。http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
References[编辑]
- ↑ William J. Kaufmann, III, Stars and Nebula, 1978, W. H. Freeman and Company, San Francisco, ISBN 0-7167-0081-6.
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当前 | 2007年1月24日 (三) 10:01 | 712 × 602(36 KB) | Pngbot(留言 | 贡献) | optimized with optipng | |
2006年12月20日 (三) 17:26 | 712 × 602(50 KB) | RJHall(留言 | 贡献) | Evolutionary stages of a solar-mass star |
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