A Study of the Four Eclipsing Binary Systems: Rw Monocerotis, RW Geminorum, U Coronae Borealis,and TY Pegasi

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Abstract
A new attempt at the determination of the photometric elements of the eclipsing binaries RW Monocerotis, RW Geminorum, U Coronae Borealis and TY Pegasi has been made from visual photometric light curves obtained by the late Drs Dugan and Pierce and published posthumously by Wood. The first three systems appear to exhibit total exclipses, and TY Pegasi is a partially eclipsing system. A notable difficulty in the solutions for RW Mon and RW Gem has been to reconcile the “shape” and “depth” ratios of the radii k of the two components; and, in the latter part of the paper, an attempt has been made to demonstrate the possibility that this is a consequence of the considerable distortion of the secondary components which, in each case, probably nearly fill the largest closed equipotential capable of containing their mass. The photometric observations are combined with spectroscopic evidence available for three of these systems, and the contact hypothesis is used to estimate the mass-ratio of the systems which leads to the determination of their absolute dimensions.

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