부산대학교 도서관

V1765 Cyg is a detached eclipsing binary containing a B0.5 supergiant and a B1 main-sequence star, with an orbital period of 13.37 d and an eccentricity of 0.315. The system shows apsidal motion and the supergiant exhibits strong stochastic variability. V1765 Cyg was observed by the Transiting Exoplanet Survey Satellite over four sectors. We analyse these data to obtain the first determinate light curve model for the system. To this we add published spectroscopic orbits to infer masses of 23 +/- 2 Msun and 11.9 +/- 0.7 Msun, and radii of 20.6 +/- 0.8 Rsun and 6.2 +/- 0.3 Rsun. These properties are in good agreement with theoretical predictions for a solar chemical composition and an age around 7 Myr. We also present two epochs of blue-optical spectroscopy that confirm the luminosity classification of the primary star and appear to show absorption lines from the secondary star. Extensive spectroscopy and further analysis of the system is recommended.
Comment: Accepted for publication in The Observatory. 17 pages, 3 tables, 9 black/white figures