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当前资源共 2条
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  • 1. ChinaXiv:202303.05013
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    M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy

    分类: 天文学 >> 天文学 提交时间: 2023-02-19

    Shuo Zhang Hua-Wei Zhang Georges Comte Derek Homeier Rui Wang Neda Hejazi Yin-Bi Li A-Li Luo

    摘要: 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 {\mu}m 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.

    同行评议状态:待评议

     点击量 46  下载量 20  评论 0
  • 2. ChinaXiv:202303.02932
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    M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy

    分类: 天文学 >> 天文学 提交时间: 2023-02-19

    Shuo Zhang Hua-Wei Zhang Georges Comte Derek Homeier Rui Wang Neda Hejazi Yin-Bi Li A-Li Luo

    摘要: 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 {\mu}m 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.

    同行评议状态:待评议

     点击量 57  下载量 22  评论 0
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