Age determination of galactic B-type stars in double-lined eclipsing binaries

We present the results of age determination for galactic B-type main sequence stars which are components of double-lined eclipsing binaries. Only detached systems are considered. We analyze 38 binary systems that meet such criteria. The analysis is based on evolutionary computations and we consider that the age is determined if there is a common value from the radius−age diagrams and the agreement in the position of both components in the Hertzsprung-Russell diagram. In some cases, to meet these two conditions, it was necessary to adjust the value of the metallicity, Z or/and the parameter of overshooting from the convective core, αov. We determine the consistent age for 33 binaries out of 38. Besides, we made an extensive computations and for each system we give the range of αov and Z, for which the consistent solutions exist. The age of the studied B-type main sequence stars ranges, as counted from the Zero Age Main Sequence, from about 2.5 Myr to about 200 Myr.本研究呈现了银河系B型主序星的年龄测定结果，这类恒星均为双谱线食双星的组成成员。本研究仅考量分离双星系统，共分析了38个符合上述标准的双星系统。本分析基于恒星演化计算，我们定义，当通过半径-年龄图得到一致的年龄数值，且双星的两个组成成员在赫罗图（Hertzsprung-Russell diagram）上的位置匹配时，即可认为该系统的年龄已被准确测定。在部分案例中，为满足上述两项条件，需对金属丰度Z以及/或者对流核超射参数αov进行调整。在38个系统中，我们成功为其中33个双星系统测定了一致的年龄数值。此外，我们开展了大量演化计算，并为每个双星系统给出了可得到一致解的αov与Z的取值范围。本研究涉及的B型主序星，其年龄以零龄主序（Zero Age Main Sequence）为起算点，范围约为2.5 Myr至200 Myr。