Atmospheric extinction in the /U-B/ color index

Details Atmospheric extinction in the /U-B/ color index Atmospheric extinction in the /U-B/ color index

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93...97g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Feb.-Mar. 1981, p. 97-104.

Astronomy and Astrophysics

Astronomy

5

Atmospheric Attenuation, Interstellar Extinction, Stellar Atmospheres, Stellar Spectrophotometry, Ubv Spectra, Accuracy, Color, Numerical Integration

Scientific paper

Various methods for obtaining the atmospheric extinction in the (U-B) color index taking into account the dependence of extinction coefficient on the intrinsic color index of the star are examined. Numerical integrations are performed to determine synthetic color indices for 32 stars of spectral classes O9 to M0 and luminosity classes I, III and V through 0, 1 and 2 air masses, resulting in three (u-b) color indices for each star. Photometric reduction of the color indices to the (U-B) color index was then performed by the classical method, by the method proposed by Gutierrez-Moreno et al. (1966) and various modifications of it, and by the method proposed by Moffat and Vogt (1977). Comparison with observations of 71 stars in the standard region E5, nine extinction standard stars and 25 Johnson standard stars in the UBV reveals that the reduction of (U-B) by the classical method gives internal errors between two and three times larger than those obtained for (B-V) and V, while the methods of Gutierrez-Moreno et al. and Moffat and Vogt provide greatly improved accuracy.

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