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标题：Modelling of integrated-light spectra from the optical to the near-infrared: the globular cluster G280 in M31
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作者：S. S. Larsen ; G. Pugliese ; J. P. Brodie 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：617
DOI：10.1051/0004-6361/201832767
语种：English
出版社：EDP Sciences
摘要：Context. In previous papers, we introduced our method for measuring chemical abundances from integrated-light spectra of globular clusters and applied it to a variety of extragalactic star clusters. Our work so far, however, has concentrated primarily on the optical range 4200 Å –6200 Å.Aims. Here we extend our analysis technique to the infrared and test it on anH-band spectrum of the massive globular cluster G280 in M 31.Methods. We simultaneously analyse an optical spectrum of G280, obtained with the HIRES spectrograph on the Keck I telescope, and anH-band spectrum obtained with NIRSPEC on Keck II. We discuss the sensitivity of our results to various modifications of the input assumptions, such as different line lists and isochrones and the possible presence of a metallicity spread in G280.Results. When using the most recent version of the Kurucz line list, we measure iron abundances of [Fe/H] = −0.68±0.02 from the optical spectrum and [Fe/H] = −0.60±0.07 from the infrared spectrum. These values agree well with previous spectroscopic determinations of the metallicity of G280. While the small difference between the optical and infrared measurements is insignificant given the uncertainties, it is also consistent with a metallicity spread similar to that observed in massive GCs such asωCen and G1, and also hinted at by the colour-magnitude diagram of G280. The optical and infrared spectra both indicate anα-enhancement of about 0.3–0.4 dex relative to solar-scaled abundances, as typically also observed in Milky Way GCs.Conclusions. From this analysis, it appears that our integrated-light analysis technique also performs well in theH-band. However, complications due to the presence of molecular bands and telluric contamination are more severe in the infrared, and accurate modelling of the coolest giants is more critical.
关键词：engalaxies: star clusters: individual: G280galaxies: star clusters: generalgalaxies: individual: M31galaxies: abundancestechniques: spectroscopic