Mid-infrared stellar interferometry and diameters of old stars

Details Mid-infrared stellar interferometry and diameters of old stars Mid-infrared stellar interferometry and diameters of old stars

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..596..275t&link_type=abstract

ART AND SYMMETRY IN EXPERIMENTAL PHYSICS. AIP Conference Proceedings, Volume 596, pp. 275-283 (2001).

Physics

Interferometry, Radii

Scientific paper

Modern technology, including laser interferometry and sensitive high speed detectors, have allowed recent developments in ``stellar'' interferometry at visible and infrared wavelengths. Three movable 1.65 meter telescopes are now installed on Mt. Wilson for interferometry in the 10 micron wavelength region using heterodyne detection with CO2 laser local oscillators. They allow imaging of dust surrounding stars by use of phase closure, and high precision measurement of stars surrounded by dust and gas, since mid-IR wavelengths penetrate the dust well and narrow spectral regions can be chosen where there are no spectral lines due to surrounding gas. Results show these older stars are somewhat larger than indicated by previous measurements due to limb darkening effects suffered by measurements at shorter wavelengths and broad spectral bandwidths. .

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