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首页> 外文期刊>Astronomy and astrophysics >A new method for an objective, χ2-based spectroscopic analysis of early-type stars - First results from its application to single and binary B- and late O-type stars
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A new method for an objective, χ2-based spectroscopic analysis of early-type stars - First results from its application to single and binary B- and late O-type stars

机译：一种用于对早期型恒星进行基于χ2的客观光谱分析的新方法-将其应用于单星和双星B型以及后期O型星的首次结果

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Context. A precise quantitative spectral analysis, encompassing atmospheric parameter and chemical elemental abundance determination, is time-consuming due to its iterative nature and the multi-parameter space to be explored, especially when done by the naked eye. Aims. A robust automated fitting technique that is as trustworthy as traditional methods would allow for large samples of stars to be analyzed in a consistent manner in reasonable time. Methods. We present a semi-automated quantitative spectral analysis technique for early-type stars based on the concept of χ2 minimization. The method’s main features are as follows: far less subjectivity than the naked eye, correction for inaccurate continuum normalization, consideration of the whole useful spectral range, and simultaneous sampling of the entire multi-parameter space (effective temperature, surface gravity, microturbulence, macroturbulence, projected rotational velocity, radial velocity, and elemental abundances) to find the global best solution, which is also applicable to composite spectra. Results. The method is fast, robust, and reliable as seen from formal tests and from a comparison with previous analyses. Conclusions. Consistent quantitative spectral analyses of large samples of early-type stars can be performed quickly with very high accuracy.
机译：上下文。精确的定量光谱分析（包括大气参数和化学元素丰度的确定）非常耗时，因为它具有迭代性质和要探索的多参数空间，尤其是用肉眼观察时。目的与传统方法一样值得信赖的强大自动拟合技术将允许在合理的时间内以一致的方式分析大型恒星样本。方法。我们提出了一种基于χ2最小化概念的半自动定量光谱分析技术，用于早期恒星。该方法的主要特征如下：主观性远低于裸眼，校正不正确的连续谱归一化，考虑整个有用的光谱范围以及同时对整个多参数空间进行采样（有效温度，表面重力，微湍流，大湍流） ，投影转速，径向速度和元素丰度）以找到全局最佳解，这也适用于复合谱。结果。从正式测试以及与先前分析的比较来看，该方法快速，可靠且可靠。结论。对早期型恒星大样本的一致定量光谱分析可以非常高精度地快速进行。

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