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Interferometric imaging diagnostics of X Hya's circumstellar environment

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arxiv 1503.01237 v1 pith:ZNSHE6WD submitted 2015-03-04 astro-ph.SR

Interferometric imaging diagnostics of X Hya's circumstellar environment

classification astro-ph.SR
keywords closeenvironmentinterferometricpulsationstarsangularangularlyasymmetric
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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 forMira 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 present 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 of its asymmetric structures.

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