Towards Understanding the Nature of Young Detached Binary System HD 350731

Abstract

The young binary system HD 350731 is a noteworthy laboratory for studying early-type binaries with similar components. We present here the analysis of differential multi-color photometric and spectroscopic observations for the double-lined detached system. Accurate absolute parameters were determined from the simultaneous solution of light and radial velocity curves for the first time. HD 350731 consists of two B8V-type components having masses and radii respectively of $M_1=2.91\pm 0.13$ M${}_{\odot }$, $M_2=2.80\pm 0.14$ M${}_{\odot }$, $R_1=2.11\pm 0.05$ R${}_{\odot }$ and $R_2=2.07\pm 0.05$ R${}_{\odot }$. The effective temperatures were determined based on analysis of disentangled spectra of the components and derived to be $12000\pm 250$ K and $11830\pm 300$ K for the primary and secondary components, respectively. The measured projected rotational velocities, 69.2$\pm$1.5 km s${}^{-1}$ for primary and 70.1$\pm$1.7 km s${}^{-1}$ for secondary, were found closer to the pseudo-synchronous velocities of the components. Comparison with evolutionary models suggests an age of 120$\pm$35 Myr. Kinematic analysis of the unevolved binary system HD 350731 revealed that it belongs to the young thin-disc population of the Galaxy.

36 pages, including 8 figures and 8 tables, accepted for publication in Astronomical Journal

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