The accretion disk spectrum of LMC X-3

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Binary Stars, Black Holes (Astronomy), Magellanic Clouds, X Ray Sources, Luminosity, Spectral Emission, Viscosity

Scientific paper

Recent observations of the optical counterpart of LMC X-3, by Cowley et al. (1983), have led to the suggestion that the optical continuum contains a component associated with the X-ray source. Under the assumption that standard accretion disk theory applies, it is shown that the above suggestion is quantitatively consistent with the observed level of X-ray emission and leads to the prediction that excess infrared and (more marginally) UV radiation could be distinguishable. Expected flux values are calculated, including a discussion of the effect of the outer disk radius on the shape of the postulated IR continuum. Correlated time-delayed light variations at different frequencies can be expected, with time delays on the order of a month to a year expected between the V and R band, depending on the disk viscosity.

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