非均匀望远镜吞吐量的天体测量效应
Astrometric effects of non-uniform telescope throughput
摘要:
在真实的望远镜中,光学参数随着时间的推移而变化,并且退化往往是不均匀的。这会引起影像轮廓的变化,从而引起照相中心的位移,除非加以校正,否则可能导致天体测量误差。个别望远镜和干涉阵列上引起的影响是通过数值实现的情况下的范围。结果进行评估的潜在影响,最相关的实验,高精度天体测量在不久的将来,即盖亚,PRIMA和SIM,并减轻技术适用于从设计阶段到校准。
英文摘要:
In real telescopes, the optical parameters evolve with time, and the degradation is often not uniform. This introduces variations in the image profile and therefore photo-centre displacements which, unless corrected, may result in astrometric errors. The effects induced on individual telescopes and interferometric arrays are derived by numerical implementation of a range of cases. The results are evaluated with respect to the potential impact on the most relevant experiments for high precision astrometry in the near future, i.e. Gaia, PRIMA and SIM, and to mitigation techniques applicable from design stage to calibrations.
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