Six southern stars with diffuse or double lines noted on objective-prism plates were observed photoelectrically.Three of them-HD 101799, HD 120734, and HD 123732-were found to be W Ursae Majoris systems, with periods of 0.37, 0.34, and 0.39 days, respectively.Four-color photometry of HD 120734 and HD 123732, if interpreted conventionally, indicates moderate metal deficiencies for these systems.
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Howard E. Bond (1970) studied this question.
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