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 ?
html) Astronomy & Astrophysics under the title "ALMA observations of the nearby AGB star L2AaAaAeAcPuppis
In the second type of models, or "common envelope" models, the companion is even closer and fully enters the envelope of the AGB star so that the two objects have a "common" envelope.
International Conference on Why Galaxies Care About AGB Star II.
Papers from the conference, collected here, look at applications of current knowledge about AGB stars, the role of AGB stars in galactic models, and the role of AGB star research within the major aims of astrophysics in the coming decades.
The transition from an AGB star to a planetary nebula happens very quickly, no more than a few centuries and sometimes as short as a few decades.
The iron-60 must have come from a supernova, or from a giant star called an AGB star.
This paper is really very interesting," says Claudia Maraston (University of Portsmouth, UK), who specializes in AGB stars and uses them to understand galaxies.
Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time; proceedings
The focus of the proposed research is on the chemical properties of AGB stars and their CSEs, and on the structure and dynamics of the mass loss that creates the CSE.
These AGB stars also fall on various periodluminosity relations and the large amplitude AGB variables (Miras) potentially rival Cepheid variables as fundamental calibrators of the distance scale.
Five silica grains were found earlier, but, because of their isotopic compositions, they are thought to originate from AGB stars, red giants that puff up to enormous sizes at the end of their lives and are stripped of most of their mass by powerful stellar winds.
For each of these galaxies extreme mass-losing AGB stars have been identified and characterized.