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Estimation of Confusion in SIM Targets With a Detailed Focal Plane Model

机译:使用详细的焦平面模型估算SIM目标中的混乱

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摘要

The Space Interferometry Mission is an unique interferometer capable of performing narrow and wide angle astrometry on a few thousands of stars, distributed all over the Galaxy. It will be designed to achieve a single epoch precision of 10 micro arc seconds and an end of mission accuracy of 4 micro arc seconds in position and a similar accuracy in parallax and proper motions. The presence of confusing background and foreground stars might impose a limitation on the astrometric accuracy. We estimate the expected single measurement position uncertainty of the targets, owing to the presence of the confusing stars, from the knowledge of the dispositions and the spectral energy distributions (SEDs) of the stars within and just outside the field-of-view (FOV) of SIM. Our model also includes details of the instrumental parameters and the measurement process. The estimated uncertainties can in turn be used to correct the bias in the single measurement astrometric delay and, thus the final astrometric accuracy can be improved. We estimate the offsets from the zero delay position of the instrument and the projected separation of the components of binary stars in an elemental observation, following an one-dimensional synthesis imaging approach and a model fit to the absolute visibility data. These simulations help us to explore the strategies that can be followed to extract the details of the field through suitable model parameters in future.
机译:空间干涉测量任务是一种独特的干涉仪,能够对分布在整个银河系中的数千颗恒星执行窄角和广角天文测量。它将被设计为达到10微弧秒的单一历元精度,位置精度达到4微弧秒的任务结束精度,以及视差和适当运动的相似精度。背景星和前景星的混淆可能会限制天文测量的准确性。根据对视场(FOV)内外的恒星的位置和光谱能量分布(SED)的了解,我们估计了目标的单个测量位置不确定性(由于存在混乱的恒星) )。我们的模型还包括仪器参数和测量过程的详细信息。估计的不确定性又可以用于校正单次测量天文测量延迟中的偏差,因此可以提高最终的天文测量精度。我们采用一维合成成像方法和适用于绝对能见度数据的模型,估算了仪器零延迟位置的偏移量和元素观测中双星恒星预计的分离距离。这些模拟有助于我们探索将来可以通过合适的模型参数提取现场细节的策略。

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