Dependence of the atmospheric extinction coefficients in the Stromgren system on spectral classes, luminosity, and interstellar reddening

Details Dependence of the atmospheric extinction coefficients in the Stromgren system on spectral classes, luminosity, and interstellar reddening Dependence of the atmospheric extinction coefficients in the Stromgren system on spectral classes, luminosity, and interstellar reddening

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..404t&link_type=abstract

(Astronomicheskii Zhurnal, vol. 62, Mar.-Apr. 1985, p. 404-407) Soviet Astronomy (ISSN 0038-5301), vol. 29, Mar.-Apr. 1985, p. 2

Astronomy and Astrophysics

Astronomy

3

Astronomical Photometry, Atmospheric Attenuation, Interstellar Extinction, Stellar Luminosity, Stellar Spectra, Stellar Color, Ubv Spectra

Scientific paper

The atmospheric extinction coefficients for the color indices of the Stromgren uvby medium-band photometric system are analyzed by the method of numerical integration. It is shown that the extinction coefficients for the color indices u-y and the indices a(1) depend in a complicated way on the spectral class and luminosity of the star and on its interstellar reddening. Neglect of this dependence leads to inconstancy of the color system of indices c(1) and to systematic errors, reaching 0.04 mag at a zenith distance of 60 deg. To allow for this effect, it is proposed to use atmospheric extinction coefficients not dependent on interstellar reddening, calculated through photometric parameters Q that are not dependent on interstellar reddening.

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