Calibration of the spectra of selected stars. III - Atmospheric extinction in absolute spectrophotometry

Physics – Optics

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Atmospheric Attenuation, Calibrating, Stellar Atmospheres, Stellar Spectra, Stellar Spectrophotometry, Aerosols, Atmospheric Optics, Bouguer Law, Optical Thickness

Scientific paper

Four-hundred-fifty instantaneous values of the atmospheric transparency coefficient p(lambda) were determined from night observations at Alma-Ata. Mean p(lambda) values were computed for observations in September 1977 and August-September 1978 as well as mean fluctuations in transparency from one observation to the next (10-20 min later) and their distribution in absolute value. It is found that the transparency does not exhibit any steady azimuthal effect. When the Bouguer method is applied nearly simultaneously to a setting star and a rising star, it yields values of pB = (ps + pr)/2 within 1-2% of the true transparency coefficient averaged over the hours of observation, provided ps and pr differ from each other by no more than 20%.

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