论文标题
GAIA数据库中银河系RR Lyrae的理论场景：视差偏移的约束
A theoretical scenario for Galactic RR Lyrae in the Gaia database: constraints on the parallax offset
论文作者
论文摘要
根据一组扩展的非线性对流RR Lyrae脉动模型，我们得出了Gaia频段中的第一条理论光曲线以及相应的强度加权平均幅度和脉动幅度。讨论了基本和第一个泛音模式脉动器，讨论了化学混合物对盖亚过滤器中衍生的贝利图的影响。推断的平均幅度和颜色用于得出Gaia滤波器中RR Lyrae的第一个理论时期 - Wesenheit关系。理论时期 - wesenheit关系在Gaia数据版本2数据库中的基本模式和第一次接种模式中的应用以及有关单个金属丰度的互补信息的应用，使我们能够得出其各个视差的理论估计。将这些结果与天文解决方案进行了比较，以结论是要与Gaia结果调和非常小的偏移（与零）相一致。
On the basis of an extended set of nonlinear convective RR Lyrae pulsation models we derive the first theoretical light curves in the Gaia bands and the corresponding intensity-weighted mean magnitudes and pulsation amplitudes. The effects of chemical com-position on the derived Bailey diagrams in the Gaia filters are discussed for both Fundamental and First Overtone mode pulsators. The inferred mean magnitudes and colors are used to derive the first theoretical Period-Wesenheit relations for RR Lyrae in the Gaia filters. The application of the theoretical Period-Wesenheit relations for both the Fundamental and FirstOvertone mode to Galactic RR Lyrae in the Gaia Data Release 2 database and complementary information on individual metal abundances, allows us to derive theoretical estimates of their individual parallaxes. These results are compared with the astrometric solutions to conclude that a very small offset, consistent with zero, is required in order to reconcile the predicted distances with Gaia results.
