Empirical calibration of the near-infrared Ca ii triplet — I. The stellar library and index definition
Empirical calibration of the near-infrared Ca ii triplet — I. The stellar library and index definition
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DOI：
10.1046/j.1365-8711.2001.04688.x
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发表时间：
2001-09
影响因子：
4.8
通讯作者：
A. Cenarro;N. Cardiel;J. Gorgas;R. Peletier;A. Vazdekis;F. Madrid;Spain.;U. Nottingham;UK.;Instituto de Astrof'isica de Canarias-Instituto-de-Astrof'isica-de-Canarias-102997450;Observatorio de Calar Alto;Almería;Spain.
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文献类型：
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作者：
A. Cenarro;N. Cardiel;J. Gorgas;R. Peletier;A. Vazdekis;F. Madrid;Spain.;U. Nottingham;UK.;Instituto de Astrof'isica de Canarias-Instituto-de-Astrof'isica-de-Canarias-102997450;Observatorio de Calar Alto;Almería;Spain.
在近红外光谱区建立了一个新的恒星库，用于caii三重态的经验校准和恒星群的综合建模。该文库涵盖1.5埃（FWHM）光谱分辨率λ λ 8348-9020范围，由706颗恒星组成，涵盖了广泛的大气参数。我们定义了一组新的近红外指数，CaT*， CaT和PaT，它们在很大程度上克服了以前定义的局限性，前者特别适合于测量经过Paschen线污染校正的Ca II三重态强度。我们还比较研究了新的和以前的Ca指数，以及不同体系之间相应的转换。深入分析了指标误差的来源，给出了指标误差的计算方法。最后，给出了整个恒星库的指数和误差测量结果以及最终光谱。
A new stellar library at the near-IR spectral region developed for the empirical calibration of the Ca II triplet and stellar population synthesis modelling is presented. The library covers the range lambda lambda 8348-9020 at 1.5-Angstrom (FWHM) spectral resolution, and consists of 706 stars spanning a wide range in atmospheric parameters. We have defined a new set of near-IR indices, CaT*, CaT and PaT, which mostly overcome the limitations of previous definitions, the former being specially suited for the measurement of the Ca II triplet strength corrected for the contamination from Paschen lines. We also present a comparative study of the new and the previous Ca indices, as well as the corresponding transformations between the different systems. A thorough analysis of the sources of index errors and the procedure to calculate them is given. Finally, index and error measurements for the whole stellar library are provided together with the final spectra.