Journal
ASTROPHYSICAL JOURNAL
Volume 652, Issue 1, Pages 650-660Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/507453
Keywords
circumstellar matter; stars : AGB and post-AGB; stars : imaging; stars : spots; surveys; techniques : interferometric
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We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 mas. These nonzero closure phases can only be generated by asymmetric brightness distributions of the target stars or their surroundings. We discuss how these results were obtained and how they might be interpreted in terms of structures on or near the target stars. We also report measured angular sizes and hypothesize that most Mira stars would show detectable asymmetry if observed with adequate angular resolution.
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