Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...36..287s&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 36, May 1979, p. 287-296.
Astronomy and Astrophysics
Astrophysics
13
Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Astronomical Models, Computerized Simulation, Hertzsprung-Russell Diagram, Limb Darkening, Orbital Elements
Scientific paper
From photoelectric and spectroscopic studies of the W UMa eclipsing binary V535 Arae (A5, V 7.2 mag) absolute dimensions are derived. Apparently, the primary (1.52 solar masses, 1.92 solar radii) has already left the main sequence. A slow period decrease (with a rate of -5 x 10 to the -8th day/yr) possibly indicates mass transfer of about 2 x 10 to the -7th solar mass/yr from the primary to the secondary (0.46 solar mass, 1.13 solar radii). Despite the only marginal contact the secondary (8050 K) almost attains the surface temperature of the primary (8200 K), in excellent accordance with the Lucy (1968) model. The primary appears not to be underluminous, although the luminosity of the secondary is about 100 times larger than that of main-sequence stars of comparable mass. The regions between the two components are found to be at least 200 K hotter than expected from the model.
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