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rdac:C10001 bibo:Article

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n4:starsindividualaador n4:binariesclose n13:papers n4:starsfundamentalparameters n4:binarieseclipsing n4:subdwarfs

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New VIC photometry of the sdOB binary AA Dor and an improved photometric model

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Abstract. New VIC CCD photometry, obtained with integration times of 20 s, of the sdOB+degenerate-dwarf eclipsing binary system AA Dor has provided new complete light curves with an rms scatter about a mean curve of ±0.004 mag. These data are analysed with an improved light2 light-curve synthesis code to yield more accurate determinations of the radii of both stars, the orbital inclination, and the flux ratio between the two components. These radii are only a little different from the values derived 25 years ago from less complete data, but the uncertainties on these values are improved by a factor of 2. The apparent discrepancy remains between the surface gravity of the sdOB primary star obtained from the light-curve solution with the published spectroscopic orbit and that obtained from non-local thermodynamic equilibrium analysis of high-resolution spectra of the sdOB star. The substantial reflection effect in the system is adequately represented by the light2 code with a bolometric albedo of unity in light curves extending from 0.35 to 2.2 μm. However, there are differences at individual wavelengths in the derived albedo, which may indicate a redistribution of flux from shorter wavelengths into the V and IC passbands.

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