On the age heterogeneity of the Pleiades, Hyades, and Sirius moving groups
On the age heterogeneity of the Pleiades, Hyades, and Sirius moving groups
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DOI：
10.1051/0004-6361:20078979
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发表时间：
2007-12
影响因子：
6.5
通讯作者：
B. Famaey;A. Siebert;A. Jorissen
中科院分区：
文献类型：
--
作者：
B. Famaey;A. Siebert;A. Jorissen
目标。我们研究了经典低速结构在局部速度场中的性质，即昴星团、毕星团和天狼星运动群。在利用小波变换将它们定位在速度空间后，我们研究了它们与运动学上与它们相关的疏散星团的关系。方法.通过直接比较视差空间中移动星群的位置与嵌入星团的等时线，我们检查是否在视差的观测误差范围内，所有移动星群都可能起源于相关星团的持续蒸发。结果我们的结论是，在每个移动的群体，恒星的分数构成叠加在背景上的速度空间过密度高于恒星的分数兼容的相关集群的等时线。因此，这些观测结果支持了昴星团、毕星团和天狼星移动群的动力学（共振）起源。
Aims. We investigate the nature of the classical low-velocity structures in the local velocity field, i.e. the Pleiades, Hyades, and Sirius moving groups. After using a wavelet transform to locate them in velocity space, we study their relation with the open clusters kinematically associated with them. Methods. By directly comparing the location of moving group stars in parallax space to the isochrones of the embedded clusters, we check whether, within the observational errors on the parallax, all moving group stars could originate from the ongoing evaporation of the associated cluster. Results. We conclude that, in each moving group, the fraction of stars making up the velocity-space overdensity superimposed on the background is higher than the fraction of stars compatible with the isochrone of the associated cluster. These observations thus favour a dynamical (resonant) origin for the Pleiades, Hyades, and Sirius moving groups.