Paper:	Joint VLTI/VLBA Observations of Mira Stars
Volume:	340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA
Page:	389
Authors:	Wittkowski, M.; Boboltz, D.A.
Abstract:	We present preliminary results on a recently started project to perform coordinated observations of Mira stars using near-infrared and radio long-baseline interferometry. We concentrate on recent observations of the Mira star S Ori. Observations with the ESO Very Large Telescope Interferometer (VLTI) were performed to measure the near-infrared diameter of the stellar surface. Concurrent VLBA observations of SiO maser emission towards this Mira star were performed to probe the structure and dynamics of the circumstellar atmosphere. Our near-infrared measurements suggest a diameter change consistent with the photometric period. The SiO maser emission appears to be at a distance of ∼2 stellar radii ( ΘUD ∼10.7mas, ΘSiO ∼20mas, both at stellar phase ∼0.7), and to show a clumpy distribution within a ring-like structure.

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