论文标题
m debdwarf Research III。破坏参数退化的光谱诊断
M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy
论文作者
论文摘要
为了了解M subdwarf光谱在低分辨率下的参数退化，我们在0.6-2.5μm的波长范围内组装了大量的光谱特征，并通过窄带指数量化的带强度。基于BT-SETTL模型序列的索引趋势，我们说明了主大气参数（TEFF，Log G，[M/H]和[Alpha/Fe]）如何影响每个光谱特征。此外，我们提出了一个四步过程来顺序确定四个参数，该过程扩展了Jao等人提出的基本思想。每个步骤都包含几个光谱特征，这些特征在确定特定的恒星参数时会破坏退化效应。最后，研究了每个光谱诊断具有不同光谱质量的可行性。结果是独立于r〜200的分辨率。
To understand the parameter degeneracy of M subdwarf spectra at low resolution, we assemble a large number of spectral features in the wavelength range of 0.6-2.5 μm with band strength quantified by narrowband indices. Based on the index trends of BT-Settl model sequences, we illustrate how the main atmospheric parameters (Teff, log g, [M/H], and [alpha/Fe]) affect each spectral feature differently. Furthermore, we propose a four-step process to determine the four parameters sequentially, which extends the basic idea proposed by Jao et al. Each step contains several spectral features that break the degeneracy effect when determining a specific stellar parameter. Finally, the feasibility of each spectroscopic diagnostic with different spectral qualities is investigated. The result is resolution-independent down to R~200.
