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High-Resolution Imaging of Dust Shells

Asymmetries and Temporal Evolution
  • John D. Monnier
  • Peter G. Tuthill
  • William C. Danchi
  • Anita Richards
Part of the Astrophysics and Space Science Library book series (ASSL, volume 283)

Abstract

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

Keywords

Mass-loss interferometry dust pulsation masers 

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • John D. Monnier
    • 1
  • Peter G. Tuthill
    • 2
  • William C. Danchi
    • 3
  • Anita Richards
    • 4
  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA
  2. 2.University of SydneyAustralia
  3. 3.NASA — Goddard Space Flight CenterUSA
  4. 4.Jodrell Bank Radio ObservatoryEngland

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