疏散星团化学丰度与测绘巡天 XI. 基于SDSS/MWM BOSS确定的星团得出的首批梯度
The Open Cluster Chemical Abundances and Mapping Survey XI. First Gradients from SDSS/MWM BOSS Determined Clusters
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中文总结 AI 辅助
本研究利用SDSS-V/MWM的BOSS与APOGEE数据构建疏散星团样本，测得金属丰度径向梯度，发现该梯度在不同单星族中无显著演化。
中文摘要 AI 辅助
第五代斯隆数字巡天（SDSS-V/MWM）中的银河系测绘器（Milky Way Mapper）项目已观测到数百万颗恒星，其中数千颗属于疏散星团。疏散星团化学丰度与测绘（OCCAM）巡天持续构建疏散星团及其成员的综合数据集，以约束银河系参数。本研究是OCCAM巡天的第十一篇成果，首次利用光学重子振荡光谱巡天（BOSS）摄谱仪观测恒星得到的恒星参数确定星团成员。我们使用SDSS-V/MWM的第20次数据发布（DR20）数据，整理出包含111个疏散星团中1883颗恒星的样本，其中95个星团是基于阿帕奇波因特天文台银河系演化实验（APOGEE）摄谱仪的红外数据的OCCAM前期样本中未包含的。该样本包含16个同时用BOSS和APOGEE摄谱仪观测到恒星的星团，我们发现[Fe/H]和[α/M]的测量结果一致。BOSS样本包含大部分年轻星团（年龄<150 Myr），补充了以老年星团为主的APOGEE样本。我们利用BOSS+APOGEE的OCCAM联合样本，约束了相对于引导半径（R_guide）的金属丰度径向梯度为-0.079±0.005 dex kpc⁻¹，相对于银心距（R_gc）的梯度为-0.082±0.006 dex kpc⁻¹，这与仅使用APOGEE数据的前期OCCAM论文结果吻合良好。最后，以年轻星团为主的BOSS星团的加入，并未改变OCCAM疏散星团样本显示该梯度在不同单星族中无显著演化的结论。
英文摘要
The Milky Way Mapper program in the fifth generation of the Sloan Digital Sky Survey (SDSS-V/MWM) has observed millions of stars, thousands of them in open clusters. The Open Cluster Chemical Abundances and Mapping (OCCAM) survey continues to create comprehensive datasets of open clusters and their members in order to constrain Galactic parameters. This eleventh contribution from the OCCAM survey is the first to use stellar parameters from stars observed with the optical Baryon Oscillation Spectroscopic Survey (BOSS) spectrograph to determine cluster membership. We use data from SDSS-V/MWM's 20th Data Release (DR20) and curate a sample of 1883 stars in 111 open clusters, including 95 not in previous OCCAM samples based on infrared data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectrograph. The sample includes 16 clusters with stars observed using both the BOSS and APOGEE spectrographs, and we find consistent agreement in measurements of both [Fe/H] and [$α/M$]. The BOSS sample includes the majority of the clusters at young ages (Age $< 150$ Myr) that complement the APOGEE sample of primarily older clusters. We use the combined BOSS+APOGEE OCCAM sample to constrain the radial metallicity gradient with respect to $R_{guide}$ ($-0.079 \pm 0.005 \text{ dex kpc}^{-1}$) and $R_{gc}$ ($-0.082 \pm 0.006 \text{ dex kpc}^{-1}$), which agree well with results from previous OCCAM papers using only APOGEE data. Finally, the inclusion of the primarily young BOSS clusters has not changed that the OCCAM open cluster sample indicates no significant evolution of this gradient in different mono-age populations.
