GAIA PARALLAX ZERO POINT FROM RR LYRAE STARS

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2016-09-02 DOI:10.5303/JKAS.2017.50.1.1
A. Gould, J. Kollmeier
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引用次数: 5

Abstract

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(π₀) 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 π₀. 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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盖亚距天琴座rr星视差零点
像喜巴谷一样,盖亚的设计目的是提供绝对视差,独立于任何天体物理参考系统。事实上,盖亚的内部视差零点误差可能比任何单独的视差误差都要小。然而,部分由于未知起源的机械问题,有许多天体物理问题,视差零点误差σ(π 0)将是根本的限制约束。这些包括到大麦哲伦星云和银河系中心的距离。我们表明,利用Lyrae RR星(RRL)在8kpc内的光度视差估计,通过超精确的红外周期-光度关系,可以独立地确定π 0的超精确值。尽管相对于明亮的类星体,RRL是缺乏竞争力的,因为相对于明亮的类星体,RRL的视差精度提高了一个数量级。我们表明,该方法在数学上是鲁棒的,并且在广泛的相关距离范围内由解析公式很好地逼近。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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