Joint VLTI/VLBA observations of Mira stars

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dc.creatorWittkowski, Markus
dc.creatorBoboltz, David A.
dc.date2003-09-15
dc.date.accessioned2026-07-07T06:22:39Z
dc.date.available2026-07-07T06:22:39Z
dc.descriptionWe 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 $\sim$ 2 stellar radii ($Θ_{\rm UD} \sim$ 10.7 mas, $Θ_{\rm SiO} \sim$ 20 mas, both at stellar phase $\sim$ 0.7), and to show a clumpy distribution within a ring-like structure.
dc.description5 pages, to appear in Proc. of "Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA", J.D Romney, M.J. Reid (eds.), ASP Conf. Ser
dc.identifierhttps://arxiv.org/abs/astro-ph/0309391
dc.identifierhttp://arxiv.org/abs/astro-ph/0309391
dc.identifierASP Conf.Ser. 340 (2005) 389
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95974
dc.subjectAstrophysics
dc.titleJoint VLTI/VLBA observations of Mira stars
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