High-resolution imaging of dust shells - asymmetries and temporal evolution

Details High-resolution imaging of dust shells - asymmetries and temporal evolution High-resolution imaging of dust shells - asymmetries and temporal evolution

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..165m&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

1

Mass-Loss, Interferometry, Dust, Pulsation, Masers

Scientific paper

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.

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