TOWARD UNDERSTANDING THE NATURE OF THE YOUNG DETACHED BINARY SYSTEM HD 350731

• Published in: The Astronomical journal 2015-08, Vol.150 (2), p.1-8
• Main Authors: Soydugan, F., Aliçavu, F., Bilir, S., Soydugan, E., Püsküllü, Ç., enyüz, T.
• Format: Article
• Language: English
• Subjects: binaries: eclipsing; Binary systems; Binary systems (materials); Detaching; Evolutionary; Kinematics; Mathematical models; Photometry; Spectra; stars: fundamental parameters; stars: individual (HD 350731)
• ISSN: 0004-6256; 1538-3881; 1538-3881
• DOI: 10.1088/0004-6256/150/2/55

ABSTRACT The young binary system HD 350731 is a noteworthy laboratory for studying early-type binaries with similar components. We present here an analysis of differential multi-color photometric and spectroscopic observations of the double-lined detached system. Accurate absolute parameters were determined for the first time from a simultaneous solution of the light and radial velocity curves. HD 350731 consists of two B8V-type components with masses and radii, respectively, of , , , and . The effective temperatures were determined based on analysis of disentangled spectra of the components and were derived to be 12,000 250 and 11,830 300 K for the primary and secondary components, respectively. The measured projected rotational velocities, 69.2 1.5 km s−1 for the primary and 70.1 1.7 km s−1 for the secondary, were found to be closer to the pseudo-synchronous velocities of the components. Comparison with evolutionary models suggests an age of 120 35 Myr. Kinematic analysis of the unevolved binary system HD 350731 revealed that it belongs to the young thin-disk population of the Galaxy.