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Paper: Interferometric Imaging Diagnostics of X Hya's Circumstellar Environment
Volume: 497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time
Page: 103
Authors: Haubois, X.; Wittkowski, M.; Perrin, G.; Kervella, P.; Ridgway, S. T.; Thiébaut, E.
Abstract: Optical interferometry is a powerful tool to investigate the close environment of AGB stars. With a spatial resolution of a few milli-arcseconds, it is even possible to image directly the surface of angularly large objects. This is of special interest for Mira stars and red supergiants for which the dust-wind is initiated from or very close to the photosphere by an interplay between pulsation and convection. Based on two-epoch interferometric observations of the Mira star X Hya, we show how the variation of the angular size with wavelength challenges pulsation models and how reconstructed images can reveal the evolution of the object shape and its asymmetric structures.
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