标题： 低金属量的二进制 (BLOeM)：OB 星的管道确定的物理特性 显示英文标题

标题： Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars

摘要： 我们旨在从大麦云的多历元VLT/FLAMES BLOeM光谱调查中确定OB星的物理性质。我们将专为分析大量OB星光谱样本设计的流程应用于BLOeM调查的叠加初始9个历元数据，利用FASTWIND恒星大气代码计算的合成模型光谱网格进行分析。由于盘面发射或SB2双星中次星的显著污染，69颗OB星被排除在分析之外。我们确定了778颗OB星的物理性质，包括Teff、log g、log L/Lsun和v_e sin i。单个O星的v_e sin i似乎呈现双峰性，而单个（中位数78 km/s）和双星（中位数200 km/s）系统的OB星的v_e sin i分布明显不同。推导出的温度与共同恒星的文献结果以及针对一部分O型和早B型恒星的基于网格的自动化工具结果大致一致，尽管表面重力的不确定性更大。旋转速度与应用于同一子集的独立工具结果大致一致。我们通过结合SMC金属丰度演化模型的贝叶斯推断方法恢复了调查设计中预期的8 Msun以下的质量截止，B型星（O型星）的中位质量分别为12.6 Msun（19.8 Msun）。光谱质量超过了演化质量，尽管表面重力的不确定性较大。我们还提供了大麦云中O星的更新目录，因为159颗BLOeM O星中有一半是新分类为O型星的。 显示英文摘要

摘要： We aim to determine the physical properties of OB stars from the multi-epoch VLT/FLAMES BLOeM spectroscopic survey of the Small Magellanic Cloud. We apply a pipeline designed to analyse large spectroscopic samples of OB stars to the co-added, initial 9 epochs of the BLOeM survey, utilising grids of synthetic model spectra computed with the stellar atmosphere code FASTWIND. 69 OB stars are excluded from the analysis owing to disk emission or significant contamination by secondaries in SB2 binaries. We determine physical properties of 778 OB stars, including Teff, log g, log L/Lsun and v_e sin i. There appears to be a bimodality in v_e sin i of single O stars, while v_e sin i distributions of OB stars are strikingly different for single (median 78 km/s) and binary (median 200 km/s) systems. Inferred temperatures are broadly in agreement with literature results for stars in common, plus results from a grid-based automization tool for a subset of O and early B stars, although uncertainties are larger for surface gravities. Rotational velocities are broadly in line with an independent tool applied to the same subset. We recover the anticipated lower mass cutoff at 8 Msun from the survey design using a Bayesian inference method coupled with SMC metallicity evolutionary models, with median masses of 12.6 Msun (19.8 Msun) for B-type (O-type) stars. Spectroscopic masses exceed evolutionary masses, albeit with large uncertainties in surface gravities. We also provide an updated catalogue of O stars in the SMC since half of the 159 BLOeM O stars are newly classified as O-type stars.