The measurements of masses and luminosities of massive stars play an important role in understanding the formation and evolution of their host galaxies. In this work, we present the measurement of masses and luminosities of 2946 OB-type stars, including 78 O-type stars and 2868 B-type stars, based on their stellar parameters (effective temperature, surface gravity, and metallicity) and the Padova and Trieste Stellar Evolution Code isochrones model. Our results show that the median mass and luminosity of the 2946 OB-type stars are 5.4 M _⊙ and log(L/L _⊙) = 3.2 with median relative errors of 21.4% and 71.1%, respectively. A good agreement between our results estimated by using our method and those derived by using the orbital motions of binary stars from the literature is found for some B-type stars. In addition, we also fit the mass–luminosity relation of B-type stars by using our derived mass and the luminosity from Gaia Data Release 3.

中文翻译：

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LAMOST DR5 测量 OB 型恒星的质量

大质量恒星的质量和光度的测量对于理解其宿主星系的形成和演化起着重要作用。在这项工作中，我们根据恒星参数（有效温度、表面重力和金属丰度）和 Padova 测量了 2946 颗 OB 型恒星的质量和光度，其中包括 78 颗 O 型恒星和 2868 颗 B 型恒星。和的里雅斯特恒星演化代码等时线模型。我们的结果表明，2946 颗 OB 型恒星的中值质量和光度为 5.4中号 _⊙和日志（L/L _⊙ ) = 3.2，中位相对误差分别为 21.4% 和 71.1%。对于一些 B 型恒星，我们使用我们的方法估计的结果与使用文献中双星轨道运动得出的结果之间有很好的一致性。此外，我们还利用盖亚数据发布 3 中推导出的质量和光度拟合了 B 型恒星的质量-光度关系。