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arXiv 1609.00728astro-ph.SRastro-ph.GA
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来自RR天琴座恒星的盖亚视差零点

Gaia Parallax Zero Point From RR Lyrae Stars

Andrew Gould, Juna A. Kollmeier

摘要:

像依巴谷一样,盖亚也被设计成提供绝对的视差,独立于任何天体物理参考系。事实上,盖亚内部的零点误差很可能比任何单个视差都要小。然而,部分由于未知原因的力学问题,有许多天体物理问题,视差零点误差$σ(π_0)$将是根本限制约束。其中包括到大麦云云和银河系中心的距离。我们表明,通过使用光度视差估计RR天琴座星(RRL)在8kpc内,通过超精确的红外周期光度关系,可以独立地确定一个超精确的值$π_{0}$。尽管它们相对于明亮的类星体缺乏,我们表明,RRL是有竞争力的,因为它们的数量级改善视差精度为每个单独的对象相对于明亮的类星体。我们表明,这种方法在数学上是强大的,以及近似的解析公式在很宽的范围内的相关距离。

英文摘要:

Like Hipparcos, Gaia is designed to give absolute parallaxes, independent of any astrophysical reference system. And indeed, Gaia's internal zero-point error for parallaxes is likely to be smaller than any individual parallax error. Nevertheless, due in part to mechanical issues of unknown origin, there are many astrophysical questions for which the parallax zero-point error $σ(π_0)$ will be the fundamentally limiting constraint. These include the distance to the Large Magellanic Cloud and the Galactic Center. We show that by using the photometric parallax estimates for RR Lyrae stars (RRL) within 8kpc, via the ultra-precise infrared period-luminosity relation, one can independently determine a hyper-precise value for $π_{0}$. Despite their paucity relative to bright quasars, we show that RRL are competitive due to their order-of-magnitude improved parallax precision for each individual object relative to bright quasars. We show that this method is mathematically robust and well-approximated by analytic formulae over a wide range of relevant distances.

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