The enigmatic variations of light in a binary system, located in Sagittarius constellation, could be explained by the presence of a variable gas disc around a hot star that revolves around a cooler star. These are the conclusions of researchers from Chile, Serbia and Poland, and published in the journal Astronomy & Astrophysics.
Source:
https://phys.org/news/2020-09-disc-gas-mysterious-sagittarius-constellation.html