The accurate determination of stellar angular diameters using broad-band stellar interferometry

Details The accurate determination of stellar angular diameters using broad-band stellar interferometry The accurate determination of stellar angular diameters using broad-band stellar interferometry

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.333..642t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 3, pp. 642-648.

Astronomy and Astrophysics

Astronomy

17

Techniques: Interferometric, Stars: Atmospheres, Stars: Fundamental Parameters, Techniques: Interferometric, Stars: Atmospheres, Stars: Fundamental Parameters

Scientific paper

The angular diameter of a star can be estimated from interferometric observations by fitting the data with the visibility function for a uniformly illuminated disc and then using published correction factors to convert the uniform-disc angular diameter to the limb-darkened angular diameter. The correction factors are strictly valid only for monochromatic light. We investigate the effect of using a broad bandwidth, and present a simple method for calculating broad-band correction factors from the monochromatic factors. The technique of fitting the data with a uniform-disc visibility function is only useful for stars with compact atmospheres and `typical' limb-darkening profiles. It should not be applied to stars with extended atmospheres or that show extreme limb darkening. These stars have visibility functions that are qualitatively different from a uniform-disc visibility function, so they can be distinguished observationally from compact-atmosphere stars.

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