Wind mass transfer in S-type symbiotic binaries III. Confirmation of a wind focusing in EG Andromedae from the nebular [OIII]λ5007 line

Abstract

Context. The structure of the wind from the cool giants in symbiotic binaries carries important information for understanding the wind mass transfer to their white dwarf companions and its fuelling. Aims. In this paper, we indicate a non-spherical distribution of the neutral wind zone around the red giant (RG) in the symbiotic binary star, EG And. Methods. We achieved this aim by analysing the periodic orbital variations of fluxes and radial velocities of individual components of the H$\alpha$ and [OIII]$\lambda$5007 lines observed on our high-cadence medium (R $\sim$ 11 000) and high-resolution (R $\sim$ 38 000) spectra. Results. The asymmetric shaping of the neutral wind zone at the near-orbital-plane region is indicated by: (i) the asymmetric course of the H$\alpha$ core emission fluxes along the orbit; (ii) the presence of their secondary maximum around the orbital phase $\phi =0.1$, which is possibly caused by the refraction effect; and (iii) the properties of the H$\alpha$ broad wing emission originating by Raman scattering on H${}^0$ atoms. The wind is substantially compressed from polar directions to the orbital plane as constrained by the location of the [OIII]$\lambda$5007 line emission zones in the vicinity of the RG at/around its poles. The corresponding mass-loss rate from the polar regions of $\lesssim 10^{-8}$ Msun/yr is a factor of $\gtrsim 10$ lower than the average rate of $\approx 10^{-7}$Msun/yr derived from nebular emission of the ionised wind from the RG. Furthermore, it is two orders of magnitude lower than that measured in the near-orbital-plane region from Rayleigh scattering. Conclusions. The startling properties of the nebular [OIII]$\lambda$5007 line in EG And provides an independent indication of the wind focusing towards the orbital plane.

arXiv comment10 pages, 8 figures

References in corpus (21)

• A catalogue of symbiotic stars
• Wind Roche-lobe overflow: Application to carbon-enhanced metal-poor stars
• Disentangling the composite continuum of symbiotic binaries I. S-type systems
• Numerical Simulations of Wind Accretion in Symbiotic Binaries
• Modelling the circumstellar medium in RS Ophiuchi and its link to Type Ia supernovae
• Raman-Scattering Wings of H alpha in Symbiotic Stars
• Wind morphology around cool evolved stars in binaries: the case of slowly accelerating oxygen-rich outflows
• Three-dimensional hydrodynamical models of wind and outburst-related accretion in symbiotic systems
• First Resolved Images of the Mira AB Symbiotic Binary at Centimeter Wavelengths
• Rotational velocities of the giants in symbiotic stars: II. Are S-type symbiotics synchronized?
• An incisive look at the symbiotic star SS Leporis -- Milli-arcsecond imaging with PIONIER/VLTI
• Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics
• New outburst of the symbiotic nova AG Peg after 165 years
• Wind mass transfer in S-type symbiotic binaries II. Indication of wind focusing
• Wind mass transfer in S-type symbiotic binaries I. Focusing by the wind compression model
• Recent photometry of symbiotic stars - XIII
• Really focused stellar winds in X-ray binaries
• Mid-IR Observations of Mira Circumstellar Environment
• EG Andromedae: A New Orbit and Additional Evidence for a Photoionized Wind
• Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus
• FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables

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