SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library—First Release
SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library—First Release
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DOI：
10.3847/1538-4357/ab3ebc
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
R. Yan;Yanping Chen;D. Lazarz;D. Bizyaev;C. Maraston;G. Stringfellow;Kyle McCarthy;S. Meneses-Goytia-S.-M
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文献类型：
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作者：
R. Yan;Yanping Chen;D. Lazarz;D. Bizyaev;C. Maraston;G. Stringfellow;Kyle McCarthy;S. Meneses-Goytia-S.-M
我们介绍了第一个发行的漫画恒星库(MASTAR)，这是一个大型的，校准良好的，高质量的经验库，覆盖波长范围3622-10354ä，分辨率为R∼1800。光谱是利用斯隆数字巡天(SDSS-IV)/阿帕奇点天文台星系演化实验2-N(APOEE-2N)观测获得的，与绘制阿帕奇点天文台附近星系地图项目使用的仪器相同。与以前的经验库相比，MaStar库将拥有更多的恒星数量和更全面的恒星参数覆盖，特别是冷矮星、低金属丰度恒星和具有不同[α/Fe]的恒星，这是通过利用文献中的恒星参数星表的复杂目标选择策略实现的。这个经验库将为恒星群合成提供一个新的基础，特别适合于漫画星系的恒星群分析。该库的第一个版本包含3321颗独特恒星的8646个高质量的每次访问光谱。与光度法相比，该库的相对通量定标精度为g−r为3.9%，r−i为2.7%，i−z为2.2%。这些数据是作为SDSS数据发布15的一部分发布的。我们预计该库的最终发布将包含超过10,000颗恒星。
We present the first release of the MaNGA Stellar Library (MaStar), which is a large, well-calibrated, high-quality empirical library covering the wavelength range 3622–10354 Å at a resolving power of R ∼ 1800. The spectra were obtained using the same instrument as used by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) project, by piggybacking on the Sloan Digital Sky Survey (SDSS-IV)/Apache Point Observatory Galaxy Evolution Experiment 2-N (APOGEE-2N) observations. Compared to previous empirical libraries, the MaStar library will have a higher number of stars and a more comprehensive stellar-parameter coverage, especially of cool dwarfs, low-metallicity stars, and stars with different [α/Fe], achieved by a sophisticated target-selection strategy that takes advantage of stellar-parameter catalogs from the literature. This empirical library will provide a new basis for stellar-population synthesis and is particularly well suited for stellar-population analysis of MaNGA galaxies. The first version of the library contains 8646 high-quality per-visit spectra for 3321 unique stars. Compared to photometry, the relative flux calibration of the library is accurate to 3.9% in g − r, 2.7% in r − i, and 2.2% in i − z. The data are released as part of SDSS Data Release 15. We expect the final release of the library to contain more than 10,000 stars.