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Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus | | Natalia Shagatova
; Augustin Skopal
; | | Date: |
17 Mar 2017 | | Abstract: | Context: Light curves (LCs) of some symbiotic stars show a different slope of
the ascending and descending branch of their minimum profile. The origin of
this asymmetry is not understood well.
Aims: We explain this effect in the ultraviolet LCs of the symbiotic binary
SY Mus.
Methods: We model the continuum fluxes in the spectra obtained by the
International Ultraviolet Explorer at 10 wavelengths, from 1280 to 3080 AA. We
consider that the white dwarf radiation is attenuated by $H^0$ atoms, $H^-$
ions and free electrons in the red giant wind. Variation in the nebular
component is approximated by a sine wave along the orbit as suggested by
spectral energy distribution models. The model includes asymmetric wind
velocity distribution and the corresponding ionization structure of the binary.
Results: We determined distribution of the $H^0$ and $H^+$, as well as upper
limits of $H^-$ and $H^0$ column densities in the neutral and ionized region at
the selected wavelengths as functions of the orbital phase. Corresponding
models of the LCs match well the observed continuum fluxes. In this way, we
suggested the main UV continuum absorbing (scattering) processes in the
circumbinary environment of S-type symbiotic stars.
Conclusions: The asymmetric profile of the ultraviolet LCs of SY Mus is
caused by the asymmetric distribution of the circumstellar matter at the
near-orbital-plane area. | | Source: | arXiv, 1703.6041 | | Services: | Forum | Review | PDF | Favorites | |
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