Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81...17p&link_type=abstract
Astronomy and Astrophysics, vol. 81, no. 1-2, Jan. 1980, p. 17-24.
Astronomy and Astrophysics
Astrophysics
15
Computerized Simulation, Eclipsing Binary Stars, Light Curve, Orbital Mechanics, Photometry, Stellar Models, Mathematical Models, Stellar Radiation, Tables (Data)
Scientific paper
Recently obtained BVR photoelectric lightcurves of the eclipsing binary u Her are interpreted by means of the computational model of Wilson and Devinney and the model of Wood. A comparison of the solutions obtained with the first model in combination with the solutions given by other authors, shows that u Her is a semi-detached system in which the secondary fills its Roche lobe. In contrast, the model of Wood yields solutions in which the radius of the secondary component exceeds its Roche lobe by about 15-20%. The probable cause seems to be a computational correlation in Woods program between the inclination of the orbit and the ratio of the radii of the components. It is concluded that for narrow, i.e., semi-detached to contact, systems the best results are obtained with the Wilson-Devinney model. Trial computations show moreover that the differences between the two programs become evident when the sum of the radii of the components exceeds about 0.5 of the distance between the components.
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