MR Cygni revisited

Details MR Cygni revisited MR Cygni revisited

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..754l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 15, 1987, p. 754-762.

Astronomy and Astrophysics

Astrophysics

11

Eclipsing Binary Stars, Stellar Atmospheres, Stellar Models, Atmospheric Models, Hertzsprung-Russell Diagram, Iterative Solution, Light Curve, Main Sequence Stars

Scientific paper

A new analysis of the eclipsing binary system MR Cygni is presented. Light curve synthesis by iterative solutions is applied to derive a mass ratio q = 0.75. Assuming the B3 primary component is on the main sequence, the authors calculate the H-R diagram location of the secondary from the light ratio and adjusted Teff. To within the accuracy of these quantities, the secondary is a B7 main-sequence object. The derived mass ratio q, together with main-sequence mass for the B3 component, implies a main-sequence secondary spectral type of B4. The photometrically determined secondary radii agree with this spectral type. The individual masses, however, derived from the radial velocity curve of the primary component, the photometrically determined i, and alternative values of q are seriously discrepant with main-sequence objects.

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