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근접-접촉 식쌍성(NCBs)의 기하학적 특성에 따른 분석
김홍연,오규동 全南大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.1
In order to understand the general properties of 'near-contact binary systems(here after NCBs)', we have collected the observed photometric parameters of 69 well known NCBs from the literature and examined the statistical properties which can provide information on some general aspects of their evolution, and we also compared them with a large sample of eclipsing binaries -761 contact systems, 2195 semi-detached systems, 669 detached systems from "catalogue of photometric and absolute elements of eclipsing variable stars" in which Svechnikov & Kuznetsov (1990) listed the geometrical elements of 3782 eclipsing binaries. We have investigated the distribution of the observational parameters of NCBs. As a result, NCBs is short with less than a day(97%) in orbital period and there are lots of EB types(some 64%) and most of spectral types(more than 90%) are A and F types. Meanwhile, according to the distribution of some physical parameters - total angular momnetum(H), mass ratio(q=Mz/Ml), total mass(Ml+Mz), total radius(Rj+Rz), temperature difference of two components("1T=Tl-Tz), distance of between two components(A), the evolutional stage of NCBs correspond within contact and semi detached system.