AGB

AGB is an acronym with several meanings across different fields. In astronomy, AGB denotes the asymptotic giant branch, a late phase in the evolution of low- to intermediate-mass stars. Stars in this stage have exhausted helium in their cores and burn hydrogen and helium in shells around a degenerate core. They exhibit large, cool envelopes and high luminosities, with episodic helium-shell flashes known as thermal pulses that drive complex changes in their structure and composition.

During the AGB phase, stars experience third dredge-up events that bring carbon and s-process elements from the interior to the surface, potentially producing carbon-rich stars. They lose mass copiously through slow, dense stellar winds, creating extended circumstellar envelopes. Over time, ongoing mass loss and shell burning lead to the ejection of the outer layers, leaving behind a hot core that becomes a white dwarf, while the expelled material may form a planetary nebula.

In German-speaking contexts, AGB also stands for Allgemeine Geschäftsbedingungen, or general terms and conditions. These are standardized contractual clauses that govern many business-to-consumer and business-to-business agreements. They outline rights and obligations, liability, payment terms, and dispute resolution. Such terms should be accessible to the other party, conform to applicable law, and respect consumer protection rules, which may restrict unfair or nontransparent provisions. The precise content and enforceability of AGB clauses can vary by jurisdiction and contract type.