First Surface-resolved Results with the IOTA Imaging Interferometer: Detection of Asymmetries in AGB stars

Details First Surface-resolved Results with the IOTA Imaging Interferometer: Detection of Asymmetries in AGB stars First Surface-resolved Results with the IOTA Imaging Interferometer: Detection of Asymmetries in AGB stars

2006-07-07

arxiv.org/abs/astro-ph/0607156v1

Astrophys.J.652:650-660,2006

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ

Scientific paper

10.1086/507453

We have measured non-zero closure phases for about 29% of our sample of 56 nearby Asymptotic Giant Branch (AGB) stars, using the 3-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 milliarcseconds. 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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