Stellar angular diameters from infrared photometry - Application to Arcturus and other stars; with effective temperatures

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Giant Stars, Infrared Astronomy, Infrared Photometry, Stellar Spectrophotometry, Stellar Temperature, Angular Resolution, Diameters, Early Stars, Interferometry, K Stars, Luminous Intensity

Scientific paper

A method for determining stellar angular diameters from absolute infrared photometry is described, and an application made to Arcturus and 27 other stars. The accuracy of the method in the best conditions using present observations is about 5 per cent, although higher accuracy is possible. The diameter deduced for Arcturus is 0.0201 plus or minus 0.0010 arcsec, corresponding to an effective temperature of 4410 plus or minus 88 K. For earlier type stars there is good agreement with the results of intensity interferometry. Effective temperatures are calculated for six other stars.

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