论文标题
Bacchus分析Apogee光谱中的弱线（Bawlas）
BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)
论文作者
论文摘要
恒星光谱中具有弱和混合光谱特征的元素在衡量中具有挑战性，需要专门的分析方法来精确测量其化学丰度。在这项工作中，我们创建了一个大约120,000个巨人的目录，这些巨人具有较高的信噪比DR17光谱，为此我们探索了弱和混合物种，以测量Na，p，s，s，v，cu，cu，ce和nd丰度和$^{12} $ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$ c/$^{13} $ c {13} $ c iSopopic ratios。我们采用Bacchus的更新版本（布鲁塞尔自动代码来表征高精度光谱）代码，使用Apogee的DR17 Aspcap管道测量的恒星参数来得出这些丰度，以识别可疑光谱线的质量标记，以及上限的处方。结合这些使我们能够对这些弱和混合物种的精确化学丰度的Apogee Spectra（Bawlas）目录中的弱线进行分析，这些目录与文献非常吻合，并改善了这些元素的座椅丰度，其中一些元素无法与Apogee当前的，网格的基于网格的方法无需计算昂贵的扩展。该新目录可以与宇宙一起使用，并为从核物理学到银河化学进化和银河系种群研究等许多科学应用提供测量。为了说明这一点，我们显示了该目录的一些用途示例，例如，表明我们观察了具有增强的S过程丰度的星星，或者我们可以使用$^{12} $ C/$ c/$^{13} $ c比率来探索沿红色巨型分支的额外混合。
Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure their chemical abundances. In this work, we have created a catalog of approximately 120,000 giants with high signal-to-noise APOGEE DR17 spectra, for which we explore weak and blended species to measure Na, P, S, V, Cu, Ce, and Nd abundances and $^{12}$C/$^{13}$C isotopic ratios. We employ an updated version of the BACCHUS (Brussels Automatic Code for Characterizing High accUracy Spectra) code to derive these abundances using the stellar parameters measured by APOGEE's DR17 ASPCAP pipeline, quality flagging to identify suspect spectral lines, and a prescription for upper limits. Combined these allow us to provide our BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS) catalog of precise chemical abundances for these weak and blended species that agrees well with literature and improves upon APOGEE abundances for these elements, some of which are unable to be measured with APOGEE's current, grid-based approach without computationally expensive expansions. This new catalog can be used alongside APOGEE and provide measurements for many scientific applications ranging from nuclear physics to Galactic chemical evolution and Milky Way population studies. To illustrate this we show some examples of uses for this catalog, such as, showing that we observe stars with enhanced s-process abundances or that we can use the our $^{12}$C/$^{13}$C ratios to explore extra mixing along the red giant branch.
