Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21811405r&link_type=abstract
American Astronomical Society, AAS Meeting #218, #114.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The modern optical interferometric observations of Mira atmospheres are discussed. The earlier near-infrared closure-phase measurements of a sample of Asymptotic Giant Branch (AGB) stars and subsequent imaging observations of a handful of brighter ones show that asymmetry is common in the cool atmospheres of late-type stars. The potential of optical interfermetric observations in conjunction with radio interferometric observations in studying the structure and kinematics of the envelope around Mira stars are highlighted. We explore the use of other interferometric observables such as (1) null-leakage in the mid-infrared, combined with near-infrared squared-visibilities in constraining the temperature structure of the extended atmosphere of Mira stars and (2) differential phase in detecting asymmetry in the molecular and dusty shells of Mira stars.
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