Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...532..467l&link_type=abstract
The Astrophysical Journal, Volume 532, Issue 1, pp. 467-473.
Astronomy and Astrophysics
Astronomy
12
Stars: Circumstellar Matter, Infrared: Stars, Stars: Agb And Post-Agb, Stars: Individual (Irc +10011, Irc +10420), Techniques: Interferometric
Scientific paper
The 11 μm fringe visibilities of IRC +10011 (= CIT3) and IRC +10420 have been measured at baselines ranging from 2 to 14 m with a two-telescope interferometer. The visibility data provide one-dimensional profiles of these two stars and their immediate surroundings with higher resolution in this spectral range than is presently possible with a single-aperture telescope. Spherically symmetric radiative transfer models suggest that IRC +10011 is surrounded by a dust shell with an inner radius subtending 0.033", which falls off in density as r-1.5, slightly slower than the r-2 expected for constant dust outflow. IRC +10420 appears to have a dust shell of inner radius 0.12", the density of which drops very slowly compared with that in a constant outflow. This implies decreasing outflow or a significant emission in the past.
Danchi William C.
Hale David D. S.
Lipman Everett A.
Monnier John D.
Townes Charles H.
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