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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References in periodicals archive ?
First, the team compiled information about the masses, luminosities, and such for stars of different ages, focusing especially on asymptotic giant branch (AGB) stars.
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.
The conditions are just right in the atmospheres of cool, aged stars--red giants and stars on the asymptotic giant branch of the Hertzsprung-Russell diagram, which charts the stages of stellar evolution (S&T: March 1999, page 43).
The responsible party is a so-called asymptotic giant branch star, which powers itself by two fusion reactions.
Such a star is called an asymptotic giant branch (AGB) star, thanks to the shape of its evolutionary track on the Hertzsprung-Russell diagram (see page 39).
We followed the Sun as it became a red giant (undergoing considerable mass loss); as it encountered a violent helium core flash; as it underwent quiescent helium burning in its core; as it became a red giant for the second time while traversing the asymptotic giant branch (AGB) |on the Hertzsprung-Russell diagram~, where it encountered violent repetitive helium shell flashes and again suffered considerable mass loss; and as it left the AGB .

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