Title: Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus
Authors: N. Shagatova, A. Skopal
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Description: Light curves of some symbiotic stars show an asymmetry of their descending and ascending parts. Supposing that this asymmetry is caused by an asymmetric distribution of matter originating from the stellar wind of the red giant – a companion of a white dwarf in the binary star, we modelled ultraviolet light curves of the symbiotic star SY Mus obtained from spectra of the „International Ultraviolet Explorer“ satellite for 10 wavelengths in the range from 1280 to 3080 A. We considered several scattering processes that are responsible for an attenuation of the white dwarf radiation. First, they are Rayleigh scattering on the hydrogen atoms and bound-free transitions of the negative hydrogen ions in neutral region around the red giant, and second, Thomson scattering and bound-free and free-free transitions of hydrogen atoms in ionized region around the white dwarf. It turned out that the light-curve models reproduce the observed asymmetry, and thus indicate the asymmetric distribution of the stellar wind material at the plane of observations.
Reference: Astronomy & Astrophysics 602, A71 (2017)
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Date and Time: 22.7. 2018 20:18:48 CEST
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