Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1331t&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Nov. 1990, p. 1331-1335.
Astronomy and Astrophysics
Astronomy
27
Astronomical Photometry, Cepheus Constellation, Color-Magnitude Diagram, Early Stars, Stellar Color, Ubv Spectra, B Stars, O Stars, Stellar Luminosity
Scientific paper
Transformation relations are derived for the conversion of Stromgren system colors for early-type stars into equivalent Johnson system colors. The relation (U - B) = 0.675 (u - b) - 0.938 is valid for O and B stars of all luminosity classes and A and F stars of luminosity classes III to V. The relation (B - V) = 1.584 (b - y) + 0.681 m1 - 0.116 is valid for O and B stars of all luminosity classes and A stars of luminosity classes III to V. No significant reddening corrections appear to be necessary with these relations, which are accurate to + or - 0.016 and + or - 0.022 in the transformed values of (B - V) and (U - B), respectively. Examples are given of color-dependent and magnitude-dependent effects in published UBV data. Such problems have important consequences for the distance scale of cluster Cepheids.
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