CXOGBS J175553.2-281633 is a cataclysmic variable, study finds

CXOGBS J175553.2-281633 is a cataclysmic variable, study finds
Optical photometry of CX137 phased at the best orbital period of P = 10.34488 h. Credit: Gomez et al., 2020.

An international team of astronomers has performed photometric observations of a binary system known as CXOGBS J175553.2-281633. Results of the study indicate that the object is a cataclysmic variable system. The finding is reported in a paper published September 18 on arXiv.org.


Cataclysmic variables are binary star systems consisting of a white dwarf primary that is accreting matter from a normal star companion. They irregularly increase in brightness by a large factor, then drop back down to a quiescent state. These binaries have been found in many environments, such as the center of the Milky Way galaxy, the solar neighborhood, and within open and globular clusters.

CXOGBS J175553.2-281633, or CX137, was initially detected as an X-ray source by the Galactic Bulge Survey (GBS). In 2012, the optical counterpart to CX137

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