Optical emission-line spectra of symbiotic binaries

Symbiotic stars are long-period interacting binaries where the compact objects, most commonly a white dwarf, is embedded in dense stellar wind of an evolved companion star. UV and soft X-ray emission accretion disk nuclear burning dwarf plays major role shaping ionisation balance surrounding material giving rise to rich line emission. In this paper, we employ 2D photoionisation calculations based on Cloudy code study state circumbinary symbiotic systems predict their spectra. Our simulations parameterized via orbital parameters binary mass-loss rate donor star, while mass rate, temperature luminosity WD computed self-consistently. We explore parameter space compute luminosities various astrophysicaly important lines. The ratios compared traditional diagnostic diagrams used distinguish from other types sources it shown how system shape these diagrams. significant part nearly fully ionized, except for "shadow" behind thus typically freely escaping