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arXiv 1107.1835astro-ph.IM
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用色散固定延迟干涉仪法精确测量径向速度仪的群延迟

Accurate Group Delay Measurement for Radial Velocity Instruments Using the Dispersed Fixed Delay Interferometer Method

Ji Wang, Jian Ge, Xiaoke Wan, Brian Lee, Nathan De Lee

摘要:

分散固定延迟干涉仪(DFDI)方法具有成本低、体积小和多目标能力等优点,在精密径向速度(RV)测量中具有广泛的应用前景。利用固定延迟干涉仪的群延迟(GD),测量恒星吸收线条纹的相移,并通过一个重要参数--相位速度尺度(PV尺度),将其转换为RV位移。本文介绍了用DFDI多普勒仪测量GD的两种方法:(1)用固定延迟干涉仪产生的白光梳测量GD;(2)用RV参考星标定GD。这两种方法提供了足够的精度GD测量和校准,给定当前RV精度DFDI多普勒仪器实现。它们可用于测量固定延迟干涉仪的GD,以利用DFDI仪器进行亚米级精度的多普勒测量。每种方法的优点和局限性进行了详细讨论。这两种方法可以作为DFDI仪器PV刻度的标准程序,并相互交叉校验。

英文摘要:

The dispersed fixed-delay Intereferometer (DFDI) method is attractive for its low cost, compact size, and multiobject capability in precision radial-velocity (RV) measurements. The phase shift of fringes of stellar absorption lines is measured and then converted to an RV shift via an important parameter, phase-to-velocity scale (PV scale), determined by the group delay (GD) of a fixed-delay interferometer. Two methods of GD measurement using a DFDI Doppler instrument are presented in this article: (1) GD measurement using white-light combs gen- erated by the fixed-delay interferometer and (2) GD calibration using an RV reference star. These two methods provide adequate precision of GD measurement and calibration, given the current RV precision achieved by a DFDI Doppler instrument. They can potentially be used to measure GD of an fixed-delay interferometer for submeter- precision Doppler measurement with a DFDI instrument. Advantages and limitations of each method are discussed in detail. The two methods can serve as standard procedures of PV-scale calibration for DFDI instruments and cross- checks for each other.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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