AI 中文总结
基于LAMOST DR11系统搜索BHB恒星，用SLAM数据驱动方法估计其大气参数，证明光谱标记中纳入颜色指数的必要性，发现[Fe/H]分布特点，给出4282颗有确定大气参数的蓝离散星列表。
AI 中文摘要
大蓝水平分支（BHB）恒星目录对研究银河系晕的子结构和运动学至关重要，准确测定其大气参数有助于了解恒星演化。本文基于LAMOST DR11系统搜索BHB恒星，识别出13988条BHB光谱，对应10236颗独特恒星，估计识别率约80%-90%，污染率≤10%。通过恒星标签机（SLAM）数据驱动方法估计大气参数，证明光谱标记中纳入颜色指数对打破有效温度和表面重力简并的必要性。发现[Fe/H]分布有凸起，多数富金属BHB恒星属于盘族，还给出4282颗有确定大气参数的蓝离散星列表。
英文摘要
Large catalogs of blue horizontal-branch (BHB) stars are essential for studying substructures and kinematics of the Galactic halo. And accurate determination of atmospheric parameters for BHB stars provides insight into stellar evolution. In this work, we perform a systematic search for BHB stars based on LAMOST DR11, and identify $13\,988$ BHB spectra, corresponding to $10\,236$ unique BHB stars. We estimate an identification rate of $\sim80\%-90\%$, and a contamination rate of $\lesssim10\%$ for our sample. Atmospheric parameters for these BHB stars are estimated via the data-driven method named the Stellar LAbel Machine (SLAM). We demonstrate the necessity of including color indices in the spectral labeling to effectively break the degeneracy between effective temperature and surface gravity. We note a bump in the distribution of [Fe/H], and most of these metal-rich BHB stars belong to the disk population. We also provide a list of 4282 blue straggler (BS) stars with determined atmospheric parameters.
Comments29 pages, 18 figures and 1 table; accepted for publication ApJS
