New online database of symbiotic variables: Symbiotics in X‑rays

Symbiotic variable stars belong to an interesting class of interacting binary systems. Since the beginning of this century, the systematic search for these objects has begun, and such surveys have led to discoveries of many new objects and dozens of candidates in the Milky Way and the Local Group. As the latest catalogue of symbiotic binaries is almost two decades old, we decided to prepare a new, online database of the galactic and extragalactic symbiotic systems. These objects are also known for their X‑ray emission. For the purpose of this work, we have prepared a census of symbiotic binaries and their properties based on observations obtained by X‑ray satellites in the previous decades. As our review has shown, the X‑ray emission seems to be a common feature of symbiotic systems, preferentially detected from nearby sources.