标题： 低金属丰度下的双星特性（BLOeM）：OB星物理性质的管道确定结果 显示英文标题

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

摘要： 我们旨在通过研究麦哲伦云的小麦哲伦星云的多历元 VLT/FLAMES BLOeM 光谱巡天来确定 OB 星的物理性质。我们将设计用于分析大量 OB 星光谱样本的管道应用到 BLOeM 巡天的合并后的前 9 个历元数据上，并利用用恒星大气代码 FASTWIND 计算的合成模型光谱网格。由于盘发射或二元 SB2 系统中的次级显著污染，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。单颗 O 星的 v_e sin i 似乎呈双峰分布，而 OB 星的 v_e sin i 分布对于单星系统（中值 78 km/s）和双星系统（中值 200 km/s）则明显不同。推断出的温度与文献结果以及对部分 O 型和早期 B 型恒星使用基于网格的自动化工具的结果大致一致，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的结果大致一致。我们使用贝叶斯推理方法结合 SMC 金属丰度演化模型，从巡天设计中恢复了预期的最低质量截止点 8 Msun，B 型（O 型）恒星的中值质量分别为 12.6 Msun（19.8 Msun）。光谱质量超过演化质量，尽管表面重力存在较大的不确定性。此外，我们还更新了 SMC 中 O 型恒星的目录，因为其中一半的 159 颗 BLOeM O 型恒星被重新分类为 O 型恒星。 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.