Metallicities from high-resolution spectra of 49 RR Lyrae variables
Metallicities from high-resolution spectra of 49 RR Lyrae variables
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DOI：
10.1093/mnras/stab857
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
C. Gilligan;B. Chaboyer;M. Marengo;J. Mullen;G. Bono;V. Braga;J. Crestani;M. Dall’ora;G. Fiorentino;M. Monelli;J. Neeley;M. Fabrizio;C. Mart'inez-V'azquez;F. Th'evenin;C. Sneden
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文献类型：
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作者：
C. Gilligan;B. Chaboyer;M. Marengo;J. Mullen;G. Bono;V. Braga;J. Crestani;M. Dall’ora;G. Fiorentino;M. Monelli;J. Neeley;M. Fabrizio;C. Mart'inez-V'azquez;F. Th'evenin;C. Sneden
准确的Lyrae RR金属丰度对于约束周期-光度-金属丰度关系（PLZ）非常重要，特别是在近红外波段。我们分析了来自南部非洲大望远镜（SALT）的69颗银河系RR天琴座恒星的高分辨率光谱。我们测量了58颗天琴座RR星的金属丰度，典型的不确定度为0.15指数。除了一个RR天琴座外，所有的天琴座都有精确的σπ。10%)视差从盖亚。将这些新的高分辨率光谱丰度与文献中对93颗恒星的类似测定相结合，我们提出了WISE W1和W2星等以及Wesenheit星等W（W1,V-W1）和W（W2,V-W2）的新PLZ关系。
Accurate metallicities of RR Lyrae are extremely important in constraining period-luminositymetallicity relationships (PLZ), particularly in the near-infrared.We analyse 69 high-resolution spectra of Galactic RR Lyrae stars from the Southern African Large Telescope (SALT). We measure metallicities of 58 of these RR Lyrae stars with typical uncertainties of 0.15 dex. All but one RR Lyrae in this sample has accurate (σπ . 10%) parallax from Gaia. Combining these new high resolution spectroscopic abundances with similar determinations from the literature for 93 stars, we present new PLZ relationships in WISE W1 and W2 magnitudes, and the Wesenheit magnitudes W(W1,V-W1) and W(W2,V-W2).