Speaker
Description
Symbiotic stars are binary systems in which a compact object, usually a white dwarf, accretes matter from its red giant companion. Theoretical studies suggest a population of 10^4-10^5 symbiotic stars in the Milky Way (e.g, Corradi & Munari, 2003), which is noticeably inconsistent with the observational results of classified symbiotic stars of ~ 400 sources (Akras, 2018). Based on their X-ray properties, symbiotic stars are categorised into four types (luna et al, 2013), and the main accretion mechanism in the majority of symbiotic stars are wind accretion (Bondi-Hoyle; Bondi & Hoyle 1944). This implies a soft X-ray emission <2.0 keV with a luminosity < 10^34 erg/s . Therefore, the eROSITA all-sky survey is an ideal survey to search for missing symbiotic in X-rays. We have performed a multi-wavelength study using data of both eROSITA and available infrared and optical surveys (WISE and 2MASS, Gaia) to search for all candidates for different types of galactic symbiotic stars. Additional UV data (Galex) and deep X-ray observations (XMM-Newton) have been used for the study of peculiar systems.
