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Apex and Kinematical Structure of Castor and Ursa Major Moving Stellar Groups
Astronomy Reports ( IF 1.1 ) Pub Date : 2020-03-31 , DOI: 10.1134/s1063772920030038
W. H. Elsanhoury

Abstract

Based on space velocity components UVW and using a recent dataset for Castor and Ursa Major moving groups, we compute the apex position with two methods. Classical convergent procedures give (AcpDcp) = (80\(_{.}^{\circ}\)7830, –17\(_{.}^{\circ}\)2598; Castor, 298\(_{.}^{\circ}\)334, –34\(_{.}^{\circ}\)6405; UMa) for Castor and Ursa Major groups. According to the AD-map method we deduce the apex position (A0, D0) = (79\(_{.}^{\circ}\)5514, –17\(_{.}^{\circ}\)3948; Castor, 304\(_{.}^{\circ}\)767, ‒35\(_{.}^{\circ}\)2045; UMa) for these two objects. These results are in good agreement with other published coordinated. Also, we calculate all parameters with a model of stream velocity ellipsoidal motions, which reveals inner kinematical structure. Finally, we consider the intrinsic variations considered with late-type moving groups (streams) for the longitude of the vertex versus temperature (spectral types).



中文翻译:

蓖麻和Ursa主要运动恒星群的顶点和运动结构

摘要

基于空间速度分量UVW并使用Castor和Ursa Major运动组的最新数据集,我们用两种方法计算顶点位置。经典收敛过程给出(A cp,  D cp)=(80 \(_ {。} ^ {\ circ} \) 7830,–17 \(__。^ {\ circ} \) 2598; Castor,298 \ (_ {。} ^ {\ circ} \) 334,–34 \(_ {。} ^ {\ circ} \) 6405; UMa)适用于Castor和Ursa Major组。根据AD-map方法,我们推导出顶点位置(A 0D 0)=(79 \(_ {。} ^ {\ circ} \) 5514,–17 \(_ {。} ^ {\ circ} \) 3948; Castor,304 \(_ {。} ^ {\ circ} \) 767,‒35\(_ {。} ^ {\ circ} \) 2045; 这两个对象。这些结果与其他已发布的协调一致。此外,我们使用流速度椭球运动模型计算所有参数,从而揭示内部运动学结构。最终,我们考虑了与后期类型的移动组(流)有关的顶点经度与温度(频谱类型)的内在变化。

更新日期:2020-04-23
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