Periodic variations in the light curves of symbiotic stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Symbiotic Stars, Astronomical Models, Light Curve, Periodic Variations, Stellar Spectra, Continuums, Stellar Luminosity, Line Of Sight, Photons, Stellar Envelopes, Lyman Spectra, Balmer Series

Scientific paper

A group of classical symbiotic binaries exhibits a periodic variation in the optical continuum due to orbital motion. This variation is usually ascribed to a reflection effect. However, we demonstrate that the reflection effect is not the correct interpretation of the light curves for some of those symbiotic stars. Our approach in solving this problem is based on the assumption of the presence of circumstellar matter located mostly between the components of a symbiotic binary. We assume that the observed wave-like variation of the brightness can be produced by a different projection of the circumstellar nebulosity into the line of sight along the orbital cycle. Two examples, EG And and V443 Her, are discussed in more detail.

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