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A Photometric Study of Sun-Spots and Faculae
Publications of the Astronomical Society of the Pacific
195 with the variation of total energy, or an expansion and contraction of the star. The variations in diameter necessary to explain the observations are from O'/OßS, nearly at maximum light, to O'/OSS, at about one-third phase after maximum light. The radial velocities which would result from these variations in diameter have a maximum of +4 km/sec. throughout minimum phase and -10 km/sec. about one-tenth phase after maximum light. To make them comparable with those obtained by thedoi:10.1086/124349 fatcat:fwitfvcxqnajlbt622saxhud4u