asymptotic giant branch
Also found in: Acronyms, Wikipedia.
asymptotic giant branch(ass-im-tot -ik) See giant.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
asymptotic giant branch[‚a‚sim¦täd·ik ‚jī·ənt ′branch]
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.