Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New VI photometry of the sdOB binary AA Dor and an improved photometric
  model   New VI CCD photometry, obtained with integration times of 20s, 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 two. 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 NLTE 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 microns to 2.2 microns. However there are differences at individual
wavelengths in the derived albedo, which may indicate redistribution of flux
from shorter wavelengths into the V and I passbands.

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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an