The evolution of disk, jet, and surface structures of symbiotic stars

Symbiotic stars are binary systems hosting a hot and a cool component in a widely separated orbit. In general, the hot component is a white dwarf. Mass transfer from the evolved cooler red giant component to the white dwarf through different mechanisms can occur in these systems. Symbiotic stars are the astrophysical laboratory hosting several complex structures which are gas and dust surrounding the system, stellar winds, accretion disk and jet/jet-like outflows. In this way, these systems allow us to study them from radio to gamma-rays in the electromagnetic spectrum. Symbiotic stars we choose to study in this thesis were AG Dra, AX Per, CH Cyg, CI Cyg and Z And. Optical band photometric observations of these selected systems are obtained and studied for their long-term light variations. X-ray archival data from XMM-Newton and Swift telescopes are also analysed. About 10% of symbiotic systems show jet and jet-like structures. These structures are generally bent (C- and S-shaped) matter/plasma outflows. In this study, we performed some numerical simulations for these bent jet structures.