
The asymptotic giant branch is the region of the Hertzsprung–Russell diagram populated by evolving low- to medium-mass stars. This is a period of stellar evolution undertaken by all low- to intermediate-mass stars (0.6–10 solar masses) late in their lives. Observationally, an asymptotic-giant-branch (AGB) star will appear as a bright red giant...
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http://en.wikipedia.org/wiki/Asymptotic_giant_branch
(AGB) Evolutionary track of a Sun-like star from main sequence to asymptotic giant branch. Image credit: NOAO A region of the Hertzsprung-Russell diagram that lies above and roughly parallel (hence the name 'asymptotic') with the red giant region. It is occ...
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http://www.daviddarling.info/encyclopedia/A/AGB.html
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