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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Image Field Deformation of LAMOST due to Differential Atmospheric Refraction
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Image Field Deformation of LAMOST due to Differential Atmospheric Refraction

机译：大气微分折射引起的LAMOST像场变形

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摘要

A vectorial expression of the image field deformation of LAMOST due to the differential atmospheric refraction is presented. The calculated results are compared with those from previous analyses based on the traditional spherical trigonometric formulas. It is demonstrated that different tangential displacements of star images during the observation tracking given by various authors are simply due to different reference points adopted. It is pointed out that the observational celestial pole is the center of the apparent diurnal motion, that, by referring to the observational celestial pole, the effect of the differential refraction on the image field of LAMOST during the 1.5-hour tracking period is approximately equivalent to a constant rotation of —13.65″ for all declination belts. It is therefore unnecessary to design a particular tracking velocity for each observation, and this will be obviously advantageous to the observation implementation. If the maximum tracking error of the fibers is 0.2″, then the fibers are required to be able to re-position during observational tracking for sky regions south of declination +20° and north of declination +60°.
机译：给出了由于大气折射引起的LAMOST像场变形的矢量表达式。将计算结果与基于传统球面三角公式的先前分析结果进行比较。结果表明，不同作者给出的观测跟踪过程中恒星图像的切向位移不同，仅仅是由于采用了不同的参考点。需要指出的是，观测天极是表观昼夜运动的中心，通过参考观测天极，在1.5小时的跟踪期内微分折射对LAMOST像场的影响大致相当。所有偏角皮带的恒定旋转角度为“ 13.65英寸”。因此，不必为每次观察设计特定的跟踪速度，这显然对观察的实现是有利的。如果纤维的最大跟踪误差为0.2英寸，则要求纤维在观测跟踪期间能够重新定位偏角+ 20°以南和偏角+ 60°以北的天空区域。

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