Publications of the MPIfR Optical & Infrared
Interferometry Group
S. Kraus, Schloerb, F.P.
Infrared imaging of
Capella with the IOTA interferometer
in: New Frontiers in Stellar Interferometry,
Proceedings of SPIE Volume 5491.
Edited by Wesley A. Traub. Bellingham, WA: The International Society
for Optical Engineering, 2004., p.56
Abstract.
We
present near infrared aperture synthesis maps of the well known binary
star Capella (alpha Aur) produced with the upgraded IOTA interferometer
on top of Mount Hopkins, Arizona. Michelson interferograms were
obtained simultaneously on three interferometer baselines in the H-band
between 2002 November 12 and 16. The simultaneous observation of
fringes on three baselines permitted a single phase closure to be
estimated along with three visibility amplitudes. Hybrid Mapping
techniques were then used to reconstruct the source brightness
distribution with a beam size of 5.4 × 2.6 mas, which allows for the
resolution of the stellar surfaces of the Capella giants. The maps
provide the first demonstration of imaging with phase closure on the
IOTA instrument.
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