Energy distributions for 12 solar-type stars and synthetic UBV photometry of the sun

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Solar Spectra, Spectral Energy Distribution, Stellar Spectrophotometry, Ubv Spectra, Balmer Series, Stellar Color

Scientific paper

New spectrophotometry for 12 solar-type stars providing virtually complete wavelength coverage between 3288 and 7000 A is reported. Instrumental colors are calculated from the solar irradiance, stellar flux curves, and adopted response functions and are transformed to the UBV system by using observed stellar colors. The resulting solar colors agree well with previously published exact counterparts. Comparison of the irradiance curves for the sun and a similar star reveals no evidence of systematic error in the Balmer-confluence region of the parent stellar flux curves. Transformation equations from this procedure appear to reproduce the UBV system for solar-type stars quite closely. Solar colors are reported for five published irradiance curves and are compared to other photometric solar colors from the literature. Indirect techniques yield solar (B-V) in the range 0.60-0.66.

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