Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..395..361b&link_type=abstract
Frontiers of Astrophysics: A Celebration of NRAO's 50th Anniversary ASP Conference Series, Vol. 395, Proceedings of the conferen
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present an overview of a program currently underway to study Asymptotic Giant Branch (AGB) stars using polychromatic imaging with the VLBA and the Very Large Telescope Interferometer (VLTI). These two high-resolution instruments allow us to probe the star and its surrounding environment at unprecedented accuracy from centimeter to near-infrared wavelengths. The regions which 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 coordinated observations of three Mira variables---S Ori, RR Aql, and GX Mon---and one supergiant star, AH Sco. Since these stars are inherently variable, it is important to get concurrent observations over multiple epochs in order to study both intra- and inter-cycle changes in the various regions of the circumstellar envelope.
Boboltz David A.
Wittkowski Markus
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