High-Resolution Imaging of Dust Shells
Advances in high-resolution imaging at visible, infrared, and radio wavelengths have allowed the circumstellar envelopes of evolved stars to be probed in unprecedented detail. While adequate to explain broadband spectral energy distributions, simplistic mass-loss scenarios (assuming spherical symmetry and continuous dust formation) have been shown to be grossly inadequate to understand the clumpy and often asymmetric dust shells recently revealed
In this paper, we will highlight a few sources that illustrate qualitatively new mass-loss phenomena, including the presence of circumstellar “disks” and evidence for sporadic, asymmetric mass ejections. Perhaps important physics is still missing from our picture of mass-loss on the AGB, for instance the effects of magnetic fields or large-scale convective motions
KeywordsMass-loss interferometry dust pulsation masers
Unable to display preview. Download preview PDF.
- Monnier, J. D. 1999, PhD thesis, University of California at BerkeleyGoogle Scholar
- Monnier, J. D., Millan-Gabet, R., Tuthill, P. G., Traub, W., Carleton, N., Coude du Foresto, V., Danchi, W. C., Lacasse, M., Morel, S., Perrin, G., & Porro, I. 2001, BAAS, 198Google Scholar
- Richards, A. 1997, PhD thesis, University of ManchesterGoogle Scholar