IAG太阳通量图集：用半经验模型进行大地校正
The IAG Solar Flux Atlas: Telluric Correction With a Semi-Empirical Model
摘要：
对太阳作为恒星的观测一直是指导恒星大气模型的关键，并且还提供了关于颗粒化和恒星活动对径向速度测量的影响的有用见解。大多数高分辨率的太阳图集都包含了跨越光学和限制光谱区域的大地线，这些光谱区域对分析有用。我们在这里提出了一个地球校正的太阳图集，覆盖0.5 - 1.0微米来自太阳光谱与傅立叶变换摄谱仪（FTS）在哥廷根天体物理研究所。该图谱是分辨率最高的光谱，在500 nm的光谱窗口内波长校准精确到+/-10 m/s。我们发现，该图集匹配的大地校正基特峰图集的3%内的地区包含大地吸收弱于50%的传输。的光谱数据的大地分量是适合与洛伦兹配置文件初始化为每个吸收功能的HITRAN参数组成的半经验模型。之间的最佳拟合大地参数描述的洛伦兹曲线的每个吸收功能的原始HITRAN值一般表现出良好的协议，考虑到大气压力和温度对我们的最终参数的影响。然而，我们确定了一个小的子集的吸收功能与较大的偏移相对于编目线参数。我们将最终的太阳图集发布在网上。我们还提供了从数据中提取的大地能谱，由于光谱的高分辨率，将有助于研究大地能谱线形状的时间演化及其对多普勒测量的影响。
英文摘要：
Observations of the Sun as a star have been key to guiding models of stellar atmospheres and additionally provide useful insights on the effects of granulation and stellar activity on radial velocity measurements. Most high resolution solar atlases contain telluric lines that span the optical and limit the spectral regions useful for analysis. We present here a telluric-corrected solar atlas covering 0.5-1.0 micron derived from solar spectra taken with a Fourier Transform Spectrograph (FTS) at the Institut für Astrophysik, Göttingen. This atlas is the highest resolution spectrum with a wavelength calibration precise to +/-10 m/s across this 500 nm spectral window. We find that the atlas matches to within 3% of the telluric-corrected Kitt Peak atlas in regions containing telluric absorption weaker than 50% in transmission. The telluric component of the spectral data is fit with a semi-empirical model composed of Lorentz profiles initialized to the HITRAN parameters for each absorption feature. Comparisons between the best-fit telluric parameters describing the Lorentz profile for each absorption feature to the original HITRAN values in general show excellent agreement considering the effects atmospheric pressure and temperature have on our final parameters. However, we identify a small subset of absorption features with larger offsets relative to the catalogued line parameters. We make our final solar atlas available online. We additionally make available the telluric spectra extracted from the data that, given the high resolution of the spectrum, would be useful for studying the time evolution of telluric line shapes and their impact on Doppler measurements.
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