# Comparative statistics and origin of triple and quadruple stars

@article{Tokovinin2008ComparativeSA,
title={Comparative statistics and origin of triple and quadruple stars},
author={Andrei Tokovinin},
journal={Monthly Notices of the Royal Astronomical Society},
year={2008},
volume={389},
pages={925-938}
}
• A. Tokovinin
• Published 19 June 2008
• Physics
• Monthly Notices of the Royal Astronomical Society
The statistics of catalogued quadruple stars consisting of two binaries (hierarchy 2 + 2), is studied in comparison with triple stars, with respective sample sizes of 81 and 724. Seven representative quadruple systems are discussed in greater detail. The main conclusions are as follows. (i) Quadruple systems of e Lyr type with similar masses and inner periods are common, in 42 per cent of the sample the outer mass ratio is above 0.5 and the inner periods differ by less than 10 times. (ii) The…
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