Post-AGB Stellar Evolution and Circumstellar Dynamics
Summary
Post-asymptotic giant branch (post-AGB) stars represent a fleeting transitional phase of low- to intermediate-mass stars as they evolve from the extended, cool asymptotic giant branch to the hot central stars of planetary nebulae. During this interval, intense mass loss reshapes the circumstellar environment, leading to the formation of dusty discs, fast bipolar outflows and complex molecular envelopes. Binary interactions frequently sculpt circumbinary discs, whose dynamics mirror those of protoplanetary systems and whose chemistry bears the imprint of nucleosynthesis and dredge-up processes earlier in the star’s life. High-resolution spectroscopy, multi-wavelength interferometry and radio observations have revealed dust grain growth, disc flaring, anisotropic winds and episodic molecular emission in the inner envelope. The interplay between radiation pressure, magnetic fields and binary torques governs the geometry and evolution of jets and equatorial structures. By linking surface abundances, isotopic ratios and kinematic signatures of jets and discs, researchers are refining models of late stellar evolution, mass-transfer efficiency and dust feedback into the interstellar medium. This field not only tests theories of stellar nucleosynthesis but also provides analogues to planet-hosting discs, underlining the broad astrophysical significance of post-AGB circumstellar physics.
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Post-AGB Stellar Evolution and Circumstellar Dynamics publication trend
The graph below shows the total number of articles in post-agb stellar evolution and circumstellar dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Post-AGB star: A low- to intermediate-mass star in transition from the asymptotic giant branch to the planetary nebula phase, characterised by intense mass loss and a shrinking envelope.
Circumbinary disc: A flattened, rotating accumulation of gas and dust surrounding a binary star system, often formed by mass transfer or common-envelope ejection.
Radiative transfer: The process by which radiation propagates through and interacts with matter, used in models to reconstruct disc structure from photometry and interferometry.
Protoplanetary nebula: A short-lived evolutionary phase between the asymptotic giant branch and planetary nebula stages, notable for molecular and dust emission features.
Bipolar jets: Collimated, high-velocity outflows launched along the rotation axis of a star or compact object, often tracing accretion processes in binary systems.
References
- What does a typical full disc around a post-AGB binary look like?. Astronomy & Astrophysics (2023).
- Gas-phase Molecules in Protoplanetary Nebulae with the 21 μm Emission Feature. The Astronomical Journal (2024).
- The structure of jets launched from post-AGB binary systems⋆. Astronomy & Astrophysics (2022).
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