Comparison of Gaia DR2 Parallaxes of Stars with VLBI Astrometry
Comparison of Gaia DR2 Parallaxes of Stars with VLBI Astrometry
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Gaia DR2 恒星视差与 VLBI 天体测量的比较
DOI：
10.3847/1538-4357/ab0e83
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发表时间：
2019
影响因子：
4.9
通讯作者：
Wang Guangli
中科院分区：
文献类型：
--
作者：
Xu Shuangjing;Zhang Bo;Reid Mark J.;Zheng Xingwu;Wang Guangli
我们将文献中来自VLBI天体测量学的恒星视差与Gaia DR2星表中的恒星视差进行了比较。我们的全部样本包括年轻的恒星物体、进化的AGB恒星、脉冲星和其他射电恒星。剔除在GaIA和VLBI视差之间有显著差异的AGB星和双星系统中的恒星，我们得到了Gaia DR2的平均系统视差偏移量−75±29μ，这与他们对−100和0μAS之间视差零点的估计一致。
We compare the parallaxes of stars from VLBI astrometry in the literature to those in the Gaia DR2 catalog. Our full sample contains young stellar objects, evolved AGB stars, pulsars, and other radio stars. Excluding AGB stars, which show significant discrepancies between Gaia and VLBI parallaxes, and stars in binary systems, we obtain an average, systematic, parallax offset of −75 ± 29 μas for Gaia DR2, consistent with their estimate of a parallax zero-point between −100 and 0 μas.