An international group of astronomers analysed the photometric and spectroscopic observations of a mysterious object in space, considered to be a potential cataclysmic variable called OGLE-BLG504.12.201843. The results of a new study showed that the object was actually an extreme dwarf new type U Gem.
OGLE-BLG504.12.201843 . Previous observations of this source have shown that it is photometrically variable with a period of 0.523419 days; its almost one-year flashes are repeated every 950-1020 days.
The nature of the O-201843 is still unclear, but given its outbreak, the object was originally classified as a candidate for cataclysmic variables. . They are dual star systems that consist of the main white dwarf, which absorbs the substance from a normal star companion. They increase luminance unevenly and then fall back to a state of rest.
After analysing spectroscopic data, scientists found that O-201843 had a Balmer absorption. The source was either a bright secondary star or a cold accretion disc. However, there were no features of the white dwarf and the usual signs of unstable accretion disc.
In summary, researchers noted that O-201843 could be a dwarf new type U Gem with extreme properties.