Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae
Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae
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DOI：
10.3847/1538-4357/abefd4
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
J. Mullen;M. Marengo;C. Martínez-Vázquez;J. Neeley;G. Bono;M. Dall’ora;B. Chaboyer;F. Th'evenin-F.-Th'e
中科院分区：
文献类型：
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作者：
J. Mullen;M. Marengo;C. Martínez-Vázquez;J. Neeley;G. Bono;M. Dall’ora;B. Chaboyer;F. Th'evenin-F.-Th'e
我们提出了新校准的周期-31-[Fe/H]关系的基本模式RR天琴座恒星的光学，并首次，中红外。这项工作的校准数据集提供了迄今为止最大和最全面的参数空间跨度，均匀的金属丰度从−3 <$[Fe/H]<$0.4和精确的傅立叶参数来自1980年ASAS-SN（V波段）和1083个WISE（NEOWISE扩展，W1和W2波段）RR Lyrics星，具有良好的采样光变曲线。我们将我们的光学周期-α 31-[Fe/H]关系与文献中可用的关系进行了比较，并证明我们的关系最大限度地减少了较低和较高金属丰度范围内的系统趋势。此外，一个直接的比较表明，我们的光学光度金属丰度是一致的，从高分辨率光谱和球状星团，支持我们的关系的良好性能。我们发现了一个内在的散射光度金属丰度（0.41德克斯在V波段和0.50德克斯在红外线），通过利用大的校准数据集，涵盖了广泛的金属丰度范围。当光学和红外波段一起使用时，这种散射变得更小（0.37 dex）。总的来说，在这项工作中推导出的关系有许多潜在的应用，包括大面积测光调查与詹姆斯韦伯太空望远镜在红外和LSST在光学。
We present newly calibrated period–ϕ 31–[Fe/H] relations for fundamental-mode RR Lyrae stars in the optical and, for the first time, mid-infrared. This work’s calibration data set provides the largest and most comprehensive span of parameter space to date, with homogeneous metallicities from −3 ≲ [Fe/H] ≲ 0.4 and accurate Fourier parameters derived from 1980 ASAS-SN (V band) and 1083 WISE (NEOWISE extension, W1 and W2 bands) RR Lyrae stars with well-sampled light curves. We compare our optical period–ϕ 31–[Fe/H] relation with those available in the literature and demonstrate that our relation minimizes systematic trends in the lower and higher metallicity range. Moreover, a direct comparison shows that our optical photometric metallicities are consistent with both those from high-resolution spectroscopy and globular clusters, supporting the good performance of our relation. We found an intrinsic scatter in the photometric metallicities (0.41 dex in the V band and 0.50 dex in the infrared) by utilizing large calibration data sets covering a broad metallicity range. This scatter becomes smaller when optical and infrared bands are used together (0.37 dex). Overall, the relations derived in this work have many potential applications, including large-area photometric surveys with James Webb Space Telescope in the infrared and LSST in the optical.