Abstract
V1016 Cyg is a symbiotic binary comprising a Mira-type evolved cool giant and a white dwarf (WD). The WD ionizes a part of the surrounding environment consisting mainly of the giant*s wind. We investigated a weak emission feature at 6545 A – a result of Raman scattering of the HeII 1025 line photons, emitted in the ionized region around the WD, on the neutral hydrogen (H0 ) atoms located around the giant. Using the scattering efficiency, η, and a simplified ionization model of symbiotic stars (SySs), we determined the mass-loss rate, FX1, from the cool giant in V1016 Cyg to 2 − 3 × 10−6 M ⊙ yr−1 .
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