论文标题
IAG太阳通量地图集:使用半经验模型的矫正校正
The IAG Solar Flux Atlas: Telluric Correction With a Semi-Empirical Model
论文作者
论文摘要
将太阳作为恒星的观察是指导恒星大气模型的关键,并还提供了有关颗粒和恒星活性对径向速度测量结果的影响的有用见解。大多数高分辨率的太阳图集都包含跨光学的典型线,并限制了用于分析的光谱区域。我们在这里提出了一个经过校正校正的太阳能图集,覆盖了0.5-1.0微米,该太阳能光谱是在für天文学家Göttingen研究所用傅立叶变换光谱仪(FTS)衍生而来的。该地图集是最高的分辨率光谱,在此500 nm光谱窗口中,波长校准精确为+/- 10 m/s。我们发现,在含有tranuric吸收的区域中,地图集匹配telliric校正的KITT峰值地图集的3%以内。光谱数据的洁尿成分与每种吸收特征初始化为Hitran参数的Lorentz概况组成的半经验模型。考虑到大气压力和温度对我们的最终参数的效果具有良好的一致性,将每个吸收特征的Lorentz曲线描述了每个吸收特征的Lorentz曲线的最佳介学参数与原始Hitran值的比较。但是,我们确定了相对于分类线参数的一小部分吸收特征。我们将最后的太阳能图集在线提供。我们还提供了从数据中提取的洁尿光谱,鉴于光谱的高分辨率,对于研究牙髓线形状的时间演变及其对多普勒测量值的影响将是有用的。
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.