X-Shooting ULLYSES：低金属丰度下的大质量恒星 II. DR1：麦哲伦云的高级光学数据产品
X-Shooting ULLYSES: Massive Stars at low metallicity II. DR1: Advanced optical data products for the Magellanic Clouds
AI总结：
本研究利用X-shooter光谱仪获取232个麦哲伦云大质量恒星的光学光谱，通过标准化归算流程制备三类高级数据产品，多数目标光谱信噪比超200，数据将向学界公开。
摘要：
利用中分辨率光谱仪X-shooter，我们获取了亚太阳金属丰度环境中235颗OB型星与沃尔夫-拉叶星（Wolf-Rayet, WR）的光谱。作为系列第二篇论文，本研究聚焦于232个麦哲伦云目标的光学观测，介绍了UVB（300-560 nm）和VIS（550-1020 nm）波段XShootU数据的统一归算流程，以及高级数据产品的制备过程。原始数据的归算基于ESO CPL X-shooter流水线，我们特别关注了响应曲线的测定，实现了狭缝损失校正、绝对流量定标、（半）自动连续谱归一化，以及大气吸收线校正。各历元的光谱经质心运动校正、重采样后叠加，两个臂的光谱被合并为单条经流量定标的光谱，覆盖整个光学波段且具有最高信噪比。我们提供三类数据产品：（1）每次UVB和VIS曝光的二维光谱；（2）响应校正前后，以及经过绝对流量定标、大气线去除、归一化和质心校正等多种处理后的一维UVB和VIS光谱；（3）结合所有可用XShootU曝光得到的、全光学波段的叠加后经流量定标和归一化的光谱。对于多数目标，UVB和VIS叠加光谱中每个分辨率元素的最终信噪比均高于200。归算后的数据与高级科学数据产品将在本文发表后向学界公开。
英文摘要：
Using the medium resolution spectrograph X-shooter, spectra of 235 OB and Wolf-Rayet (WR) stars in sub-solar metallicity environments have been secured. [...]This second paper focuses on the optical observations of 232 Magellanic Clouds targets. It describes the uniform reduction of the UVB (300 - 560 nm) and VIS (550 - 1020 nm) XShootU data as well as the preparation of advanced data products [...] . The data reduction of the raw data is based on the ESO CPL X-shooter pipeline. We paid particular attention to the determination of the response curves [...] We implemented slit-loss correction, absolute flux calibration, (semi-)automatic rectification to the continuum, and a correction for telluric lines. The spectra of individual epochs were corrected for the barycentric motion, re-sampled and co-added, and the spectra from the two arms were merged into a single flux calibrated spectrum covering the entire optical range with maximum signal-to-noise ratio. [...] We provide three types of data products: (i) two-dimensional spectra for each UVB and VIS exposure; (ii) one-dimensional UVB and VIS spectra before and after response-correction, as well as after applying various processing, including absolute flux calibration, telluric removal, normalisation and barycentric correction; and (iii) co-added flux-calibrated and rectified spectra over the full optical range, for which all available XShootU exposures were combined. For many of the targets, the final signal-to-noise ratio per resolution element is above 200 in both the UVB and the VIS co-added spectra. The reduced data and advanced scientific data products will be made available to the community upon publication of this paper. [...]
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