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The Hyades Cluster is used to analyze details of the AD-diagram method developed in our earlier works and applied to the corona of the Ursa Major stream. Hipparcos data are used to analyze the kinematics of the Hyades Cluster and determine its apex. Evidence for rotation of the cluster is presented. 相似文献
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The region of Orion’s Sword with coordinates α = 83.79°, δ = −5.20° and a size of 1.0° × 2.5° is analyzed. We compiled a master
catalog of stars observed in the optical, containing positions, proper motions, and UBV photometry for 1634 stars. Using the nearest-neighbor-distance technique, we subdivided the region into stellar groups with
different numbers of members. The positions of five groups coincide with known clusters, and two groups coincide with aggregates
of stars with Hα emission. We have identified groups with low membership that are moving away from the system. We also considered
the kinematic structure of the groups using the AD-diagram method we developed earlier. Most of the stellar clusters and groups display similar kinematics, with the exception
of the group OMC-2, which is moving toward its own apex. We also confirmed the existence of the kinematic star group 189 discovered
earlier; its position is close to the cluster NGC 1977, and it is probably a component of its corona. 相似文献
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We have studied some kinematic features of the coronas of near-solar stellar streams, based on Hipparcos observations. Apex diagrams for kinematic streams, open clusters, and field stars are plotted. In our analysis, we used the apex-diagram (AD) method we developed earlier. We find that the Eggen streams and Arcturus stream have similar properties, providing evidence for kinematic inhomogeneity of their coronas and the existence of stellar groups such as those detected in the corona of the Ursa Major stream. 相似文献