论文标题
OB关联中高亮度星的距离尺度和与Gaia Dr2的现场。虚假的系统动作
Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions
论文作者
论文摘要
我们计算了47个OB关联的中位视差，其中包括至少10颗具有已知GAIA DR2可视性的恒星。 OB关联的三角学和光度视差之间的比较表明，零点的偏移delta_pi = -0.11 +\ - 0.04 MAS，表明GAIA DR2可视性平均被低估了，并且被衍生的距离被低估了。 Delta_pi = -0.11 MAS的校正与Arenou等人的估计值一致。 （2018年）获得了明亮的恒星。对OB关联和高发光田间恒星的视差分析证实了我们先前的结论（Dambis等，2001），Blaha和Humphreys（1989）建立的OB恒星的距离尺度必须减少10--20％。发现在距太阳2--3 kpc的距离为10-20 km S-1的虚假系统运动是由于未校正的Gaia DR2可视性引起的。
We calculated the median parallaxes for 47 OB associations including at least 10 stars with known Gaia DR2 parallaxes. A comparison between trigonometric and photometric parallaxes of OB associations reveals a zero-point offset of delta_pi=-0.11 +\- 0.04 mas indicating that Gaia DR2 parallaxes are, on average, underestimated and the distances derived from them are overestimated. The correction of delta_pi=-0.11 mas is consistent with the estimate that Arenou et al. (2018) obtained for bright stars. An analysis of parallaxes of OB associations and high-luminosity field stars confirms our previous conclusion (Dambis et al. 2001) that the distance scale for OB stars established by Blaha and Humphreys (1989) must be reduced by 10--20%. Spurious systematic motions of 10--20 km s-1 at the distances of 2--3 kpc from the Sun are found to arise from the use of the uncorrected Gaia DR2 parallaxes.
