| |
 |
| 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. |
|
|
|
|
|
