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The short-period end of the contact binary period distribution based on the All-Sky Automated SurveyRucinski, Slavek M
Monthly Notices of the Royal Astronomical Society, 11/2007, Letnik: 382, Številka: 1Journal Article
The search volume-corrected period distribution of contact binaries of the W UMa type appears to reflect primarily the constant number ratio of ≃1/500 to the number of stars along the main sequence; there exist no evidence for angular momentum evolution. The maximum in contact binary numbers is located at shorter periods than estimated before, P≃ 0.27 d. The drop in numbers towards the cut-off at P≃ 0.215–0.22 d still suffers from the small number statistics while the cut-off itself remains unexplained. Only one out of seven short-period All-Sky Automated Survey variables with P < 0.22 d have been retained in the sample considered here within 8 < V < 13; this short-period field-sky record holder at P= 0.2178 d should be studied.
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