过渡系统的齐次研究（HoSTS）。II。谱线表对恒星参数的影响
The Homogenous Study of Transiting Systems (HoSTS). II. The influence of the line list on stellar parameters
摘要：
使用高分辨率、高信噪比的恒星光谱对于通过光谱学确定最准确和精确的恒星大气参数至关重要。这对于确定系外行星的基本参数特别重要，这些参数直接取决于恒星的性质。然而，在分析这些光谱时可以实施不同的技术，这将影响结果。其中包括相对于太阳值进行丰度分析，以消除原子数据中的不确定性，并将表面重力（log g）固定为外部值，如来自星震学的值。所用线条的选择也会影响结果。在本文中，我们研究微分分析和固定日志g的一组FGK星，已经有准确的基本参数已知的外部方法。我们发现，差分线列表给出了更精确的参数相比，实验室线列表，但实验室线列表仍然给出了强大的参数。我们还发现，固定的log g不改善光谱参数。我们调查的恒星参数上的线的选择的影响，并发现使用的线的选择可以有显着的影响的参数。特别是，某些低激发电位线的去除可以改变Teff高达50 K。在未来的HostS论文中，我们将使用太阳微湍流值为1 km/s的差分线表，并且我们不会将log g固定为外部值。
英文摘要：
The use of high resolution, high signal-to-noise stellar spectra is essential in order to determine the most accurate and precise stellar atmospheric parameters via spectroscopy. This is particularly important for determining the fundamental parameters of exoplanets, which directly depend on the stellar properties. However, different techniques can be implemented when analysing these spectra which will influence the results. These include performing an abundance analysis relative to the solar values in order to negate uncertainties in atomic data, and fixing the surface gravity (log g) to an external value such as those from asteroseismology. The choice of lines used will also influence the results. In this paper, we investigate differential analysis and fixing log g for a set of FGK stars that already have accurate fundamental parameters known from external methods. We find that a differential line list gives slightly more accurate parameters compared to a laboratory line list, however the laboratory line list still gives robust parameters. We also find that fixing the log g does not improve the spectroscopic parameters. We investigate the effects of line selection on the stellar parameters and find that the choice of lines used can have a significant effect on the parameters. In particular, removal of certain low excitation potential lines can change the Teff by up to 50 K. For future HoSTS papers we will use the differential line list with a solar microturbulence value of 1 km/s, and we will not fix the log g to an external value.
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