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arXiv 0901.3511gr-qc
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物理参考系与广义相对论中的星向测量I.恒星像差

Physical Reference Frames and Astrometric Measurements of Star Direction in General Relativity \\I. Stellar Aberration

Mariateresa Crosta, Alberto Vecchiato

摘要:

现代空间天体测量的高精度要求使用广义相对论来模拟恒星光通过引力场从一个源到太阳系内给定观测者的传播。在这个意义上,相对论天体测量学是基础物理学的一部分。天体测量的广义相对论定义需要适当使用参考系的概念,然后应将其与确定天体坐标系的IAU决议(2000年)的约定联系起来。在广义相对论的背景下,天体测量观测量的一致定义对于唯一地找到恒星坐标和自行也是必不可少的,这是逆射线追踪问题的主要物理任务。这项工作的目的是设置两个相对论模型,GREM和RAMOD(盖亚,欧空局任务)的相互一致性的水平,以保证一个物理上正确的定义光的方向,一个基本的项目推导出恒星坐标和自行在相同的测量精度水平。

英文摘要:

The high accuracy of modern space astrometry requires the use of General Relativity to model the propagation of stellar light through the gravitational field encountered from a source to a given observer inside the Solar System. In this sense relativistic astrometry is part of fundamental physics. The general relativistic definition of astrometric measurement needs an appropriate use of the concept of reference frame, which should then be linked to the conventions of the IAU Resolutions (2000), which fix the celestial coordinate system. A consistent definition of the astrometric observables in the context of General Relativity is also essential to find uniquely the stellar coordinates and proper motion, this being the main physical task of the inverse ray tracing problem. Aim of this work is to set the level of reciprocal consistency of two relativistic models, GREM and RAMOD (Gaia, ESA mission), in order to garantee a physically correct definition of light direction to a star, an essential item for deducing the star coordinates and proper motion within the same level of measurement accuracy.

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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