asymptotic giant branch


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asymptotic giant branch

(ass-im-tot -ik) See giant.

asymptotic giant branch

[‚a‚sim¦täd·ik ‚jī·ənt ′branch]
(astronomy)
A grouping of stars on the Hertzsprung-Russell diagram that is roughly asymptotic to the giant branch; it represents a later stage in giant-star evolution in which hydrogen-fusing and helium-fusing shells surround a core in which both hydrogen fusion and helium fusion are exhausted. Abbreviated AGB.
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Abstract: Planetary Nebulae represent a powerful window into the evolution of low-intermediate mass stars that have undergone extensive mass-loss on the asymptotic giant branch.

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