Coordinated Radio/Infrared Interferometry of Long-Period Variable Stars

Details Coordinated Radio/Infrared Interferometry of Long-Period Variable Stars Coordinated Radio/Infrared Interferometry of Long-Period Variable Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5707b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #57.07; Bulletin of the American Astronomical Society, Vol. 39, p.831

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the latest results from an ongoing program to study long-period variable stars using polychromatic interferometry with the Very Long Baseline Array (VLBA) and the Very Large Telescope Interferometer (VLTI). These two high-resolution instruments allow us to probe a star and its surrounding environment at unprecedented accuracy from centimeter to near-infrared wavelengths. The regions that we are able to study, working outward from the star itself, include: the photosphere (VLTI/AMBER, near-IR), the molecular layer (VLTI/MIDI, mid-IR), the SiO maser shell (VLBA/SiO, 7mm), the dust shell (VLTI/MIDI, mid-IR), and the circumstellar wind region (VLBA/H2O, 1.3cm). Thus far, we have made concurrent VLBA/VLTI observations of four long-period variable stars - AH Sco, GX Mon, S Ori, and RR Aql. Here we present multi-epoch images of the SiO masers in the circumstellar atmosphere of GX Mon. We relate the SiO maser shell to characteristics of the photosphere, the molecular layer and the circumstellar dust formation zone as determined from VLTI-MIDI observations.

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