AAS Meeting #193 - Austin, Texas, January 1999
Session 82. Circumstellar Material, Planetary Nebulae and Extra-Solar Planets
Oral, Friday, January 8, 1999, 10:00-11:30am, Room 8 (A,B,C)

[Previous] | [Session 82] | [Next]

[82.02D] Infrared Interferometry and Spectroscopy of Circumstellar Envelopes

John D. Monnier, Peter G. Tuthill, Charles H. Townes, Manfred Bester, William C. Danchi, David Hale, Everett Lipman (UC Berkeley)

The Keck-I telescope has been converted into a VLA-style interferometric array using aperture masking techniques, allowing infrared imaging with true diffraction-limited resolution (<60 mas at 2.2 microns). This represents nearly a factor of 3 increase in resolution over most previous observations in the near-IR, sufficient to resolve clumpy, asymmetric mass-loss on the AGB and circumstellar material around Wolf-Rayets and YSOs. Proper motions of dust features are also reported, yielding critical dynamical information and providing new insight into the mass-loss processes of evolved stars.

In addition, I will discuss a unique experiment on the 10 micron heterodyne interferometer, the Infrared Spatial Interferometer. An RF filterbank has recently been constructed and installed, allowing interferometry with spectral resolution as high as \lambda/\Delta \lambda ~5\times 105. Application of this technique to studying molecule formation around AGB stars is described, and initial results on IRC +10216 and VY CMa presented.

If you would like more information about this abstract, please follow the link to http://isi9.mtwilson.edu/isi. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: monnier@sunspot.ssl.berkeley.edu

[Previous] | [Session 82] | [Next]