DISTANCE-DEPENDENT OFFSETS BETWEEN PARALLAXES FOR NEARBY STARS AND GAIA DR1 PARALLAXES
DISTANCE-DEPENDENT OFFSETS BETWEEN PARALLAXES FOR NEARBY STARS AND GAIA DR1 PARALLAXES
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DOI：
10.3847/2041-8205/832/1/l18
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
Wei-Chun Jao (饒惟君);T. Henry;A. Riedel;J. Winters;Kenneth J. Slatten;D. Gies
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文献类型：
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作者：
Wei-Chun Jao (饒惟君);T. Henry;A. Riedel;J. Winters;Kenneth J. Slatten;D. Gies
我们使用612颗单星，将它们与之前公布的三角视差放置在25pc内，以评估盖亚第一次数据发布（DR1）中发布的视差。我们发现盖亚视差平均比这些恒星在太阳附近的加权平均三角视差值小0.24±0.02 mas。我们还发现，偏移量随着距离的变化而变化，达到100pc，也就是说，恒星越近，偏移量越大。我们没有发现视差偏移与恒星V星等、V - K颜色或固有运动的系统趋势。我们确实发现，黄道以南的恒星的偏移量大约是黄道以北恒星的两倍。
We use 612 single stars with previously published trigonometric parallaxes placing them within 25 pc to evaluate parallaxes released in Gaia’s first data release (DR1). We find that the Gaia parallaxes are, on average, 0.24 ± 0.02 mas smaller than the weighted mean trigonometric parallax values for these stars in the solar neighborhood. We also find that the offset changes with distance out to 100 pc, in the sense that the closer the star, the larger the offset. We find no systematic trends in the parallax offsets with stellar V magnitude, V − K color, or proper motion. We do find that the offset is roughly twice as large for stars south of the ecliptic compared to those that are north.