Circumstellar shells as a research area focus on the structure, composition, formation, and evolution of shell-like gas and dust envelopes surrounding stars at various evolutionary stages, particularly asymptotic giant branch (AGB) stars, red supergiants, and some massive stars. Studies integrate high-resolution spectroscopy, interferometry, millimeter/submillimeter observations, and radiative transfer and hydrodynamic modeling to characterize mass-loss processes, dust nucleation and growth, chemical enrichment, and interaction with the interstellar medium. This field also investigates shell morphologies (e.g., spherical, clumpy, or asymmetric), episodic or pulsation-driven mass loss, and the role of circumstellar shells in shaping planetary nebulae and contributing to galactic chemical evolution.
Using the Very Large Telescope (VLT), Chilean astronomers have observed a cataclysmic variable known as V1425 Aql. As a result, they have found that this system hosts an arc-shaped nova shell. The finding is presented in ...
Evidence suggests that carbon nanotubes, tiny tubes consisting of pure carbon, could be forged in the envelopes of dust and gas surrounding dying stars. The findings propose a simple, yet elegant mechanism for the formation ...
Nanophysics
Jun 17, 2022
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