Stellar Interferometry in the infrared in the presence of thermal background

Details Stellar Interferometry in the infrared in the presence of thermal background Stellar Interferometry in the infrared in the presence of thermal background

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........1c&link_type=abstract

PhD Thesis

Physics

1

Interferometric Instruments, Stellar Interferometry, Late-Type Stars, Thermal Infrared, Thermal Background

Scientific paper

The physical characteristics of the circumstellar environments of evolved stars are such that thermal infrared is the most suited for their study. The minimal angular resolution required needs diameters of telescopes up to a few tens of meters; one has therefore to use interferometers. Thermal background is a specific problem at those wavelengthes, and the classical visibility estimators in optical interferometry have to be adapted. This work establishes the constraints that are imposed on the background estimation in optical interferometry, then proposes new methods of subtraction or partial correction adapted to the estimators foreseen for the 10µm instrument MIDI of the VLTI. I then give a practical application example of those techniques, with the results obtained in the L band with the TISIS instrument on IOTA, concerning a few mira and semi-regular stars.

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