V453 Cygni

V453 Cygni is a detached eclipsing binary star system located in the constellation of Cygnus. It consists of two massive early B-type subgiant stars in a short-period, slightly eccentric orbit. The system is a member of the young open cluster NGC 6871 and exhibits β Cephei type pulsations in its primary component, making it a key object for studying the evolution and internal structure of high-mass stars. Another star system similar to V453 Cygni is HD 227586.

Observation

V453 Cygni was identified as a variable star in the early 20th century. Detailed photometric observations in the 1960s and 1970s revealed its eclipsing nature, with apsidal motion detected in 1973. High-resolution spectroscopy and light curve analyses in the 2000s provided precise absolute dimensions, confirming its membership in NGC 6871. In 2020, data from NASA's Transiting Exoplanet Survey Satellite revealed β Cephei-type pulsations in the primary star, marking V453 Cygni as the first such pulsating star with a dynamically measured precise mass.