About the Database

New Online Database of Symbiotic VariablesSymbiotic variables are strongly interacting systems in which physical mechanisms related to the transfer and accretion of matter cause observable activity. Typically, these systems comprise a cool giant of spectral type K-M paired with a hot compact star, often a white dwarf. Mass transfer likely occurs from the stellar wind of the cool giant, which also acts as the source of a dense circumbinary envelope. The complexity of these objects' light curves and spectra arises from the contribution of multiple sources and mechanisms. Investigating these detached binaries with orbital periods spanning hundreds to thousands of days necessitates long-term monitoring. These systems are also interesting from the evolutionary point of view as they may be one of the progenitors of type Ia supernovae.

The New Online Database of Symbiotic Variables serves as a comprehensive catalog of all known symbiotic stars with consistent references and a user-friendly web portal for efficient access to information. This online resource allows for the immediate addition of newly discovered objects and the updating of data when available, ensuring that up-to-date lists and specific object information are readily accessible to the community.

The Database contains data about the position of the objects, brightness in different spectral regions, and other observational properties such as the presence of outbursts, flickering, detectable X-ray or radio emission, symbiotic type, and others. Orbital properties, such as orbital period, orbital ephemeris, the presence of eclipses, as well as parameters of the binary components (e.g., spectral types, effective temperatures, masses, radii, luminosities, presence of pulsations) are also included.

The presented data is organized in tables accessible directly through the web portal or downloadable in different formats (csv, xlsx). Additionally, object pages are available, offering comprehensive information, references, and notes for all symbiotic binaries in the Database. These pages also provide links to SIMBAD, CDS, and VSX portals, with future plans to include direct links to measurements from sky surveys like OGLE, MACHO, and ASAS-SN.

The web portal not only caters to researchers seeking information about specific symbiotic binaries but also serves observers, whether professional or amateur, facilitating their planning of observation programs.

TThe Database is divided into two main sections based on the location of symbiotic variables. The first part comprises over 1000 galactic objects, while the second part covers extragalactic symbiotic systems located in 15 galaxies, including (LMC, SMC, Draco Dwarf, IC 10, M31, M33, M81, M87, NGC 55, NGC 185, NGC 205, NGC 300, NGC 6822, Sculptor Dwarf, Willman 1).

Currently, the Database is mirrored on two servers, ensuring uninterrupted access to the website even in the event of server operation interruptions.