MR Cyg and u Her - Two similar eclipsing binaries

Details MR Cyg and u Her - Two similar eclipsing binaries MR Cyg and u Her - Two similar eclipsing binaries

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..161s&link_type=abstract

Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 161-168.

Astronomy and Astrophysics

Astrophysics

15

Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Curve Fitting, Electrophotometry, Main Sequence Stars, Mass Transfer

Scientific paper

Several sets of photoelectric observations of MR Cyg and u Her are analyzed simultaneously by computer in an attempt to obtain geometric elements that would reproduce all the observations. (O-C) diagrams are plotted which indicate that MR Cyg apparently experienced an abrupt period change around 1966, while u Her seems not to have undergone a change of period in the nearly 100 years covered by the observations. Theoretical light curves are calculated using seven different sets of elements for MR Cyg and three sets for u Her. It is found that no single set of photometric elements can be determined for MR Cyg from the presently available light curves and that a mass ratio cannot be determined for u Her from the photometry. Absolute dimensions are given for both systems on the basis of previously computed mass functions. It is suggested that u Her and MR Cyg are quite similar and that MR Cyg cannot be regarded as a normal detached system since the secondary component is further evolved than the primary and seems to be well-outside the main-sequence band. A semidetached model for MR Cyg is proposed as the best alternative, and some properties of several Algol-type systems are intercompared.

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