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Published online by Cambridge University Press: 12 April 2016
An attempt is made to trace back the possible progenitor systems of the Algol-type binaries TU Mon, SX Cas, and DM Per. The present characteristics are compared to the result of the evolution of 9 M0 + 5.4 M0. The position of the hot components in the HRD is discussed with regard to the theoretical models.
Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on ‘Double Stars: Physical Properties and Generic Relations', held at Bandung, Indonesia 3-7 June, 1983.