论文标题
GAIA EDR3视差零点的空间依赖性校正基于30万Lamost DR8巨星
A spatially dependent correction of Gaia EDR3 parallax zero-point offset based on 0.3 million LAMOST DR8 giant stars
论文作者
论文摘要
我们研究了GAIA早期数据版本3（EDR3）视差的零点偏移，该样本基于从Lamost数据中构建的30万巨星的样本，其距离精度高于8.5 \％。 The official parallax zero-point corrections largely reduce the global offset in the Gaia EDR3 parallaxes: the global parallax offsets are $-$27.9 $μ$as and $-$26.5 $μ$as (before correction) and $+$2.6 $μ$as and $+$2.9 $μ$as (after correction) for the five- and six-parameter solutions, respectively.原始视差测量值的偏差显着取决于$ g $ $ $的尺寸，光谱颜色和恒星位置。官方的视差零点校正可以用$ g $的幅度减少视差偏置模式，而无法完全考虑光谱颜色和位置空间中的模式。在当前的论文中，首先提供了Lamost足迹中GAIA EDR3五参数溶液的空间依赖性视差零点校正模型，并在样品中具有大量恒星的优势。
We have studied the zero-point offset of Gaia early Data Release 3 (EDR3) parallaxes based on a sample of 0.3 million giant stars built from the LAMOST data with distance accuracy better than 8.5\%. The official parallax zero-point corrections largely reduce the global offset in the Gaia EDR3 parallaxes: the global parallax offsets are $-$27.9 $μ$as and $-$26.5 $μ$as (before correction) and $+$2.6 $μ$as and $+$2.9 $μ$as (after correction) for the five- and six-parameter solutions, respectively. The bias of the raw parallax measurements is significantly dependent on the $G$ magnitudes, spectral colors, and positions of stars. The official parallax zero-point corrections could reduce parallax bias patterns with $G$ magnitudes, while could not fully account the patterns in the spaces of the spectral colors and positions. In the current paper, a spatially dependent parallax zero-point correction model for Gaia EDR3 five-parameter solution in the LAMOST footprint is firstly provided with the advantage of huge number of stars in our sample.
