Other
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979s%26t....58..130e&link_type=abstract
Sky and Telescope, vol. 58, Aug. 1979, p. 130-134.
Other
1
Astrometry, Astronomical Photometry, Diameters, Stellar Magnitude, Angular Resolution, Calibrating, Cepheid Variables, Colorimetry, Light Curve
Scientific paper
Various techniques for measuring the angular diameters of stars are surveyed. Direct approaches covered include the speckle interferometry technique, which relies on the fact that, in perfect seeing with a large telescope, the diffraction pattern of a star image contains information about the star's true angular size, provided this is comparable with or larger than the so-called Dawes limit. In addition the relationship of stellar diameters and temperatures is examined. A relationship is presented which gives a simple method of calculating the angular size of a star from photometric observations alone, provided the visual surface-brightness parameter can be inferred from the color index of the star. Finally calibration, application, and other uses of the relation are studied.
Barnes Th. G.
Evans Silvan D.
Lacy Claud H.
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