根据最新数据估算皮克托里斯运动群的运动年龄

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astronomy Letters-A Journal of Astronomy and Space Astrophysics Pub Date : 2024-07-22 DOI:10.1134/S1063773724700117

V. V. Bobylev, A. T. Bajkova

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引用次数: 0

摘要

Abstract The kinematics of about 40 single stars belonging to the $\beta$ Pictoris moving group is studied.根据这些恒星的地基视线速度测定结果，用两种方法估算了Pictoris移动星团的年龄。这两种估计都是运动学的。在第一种方法中，我们考虑了恒星的回溯轨迹，得到了 $t=13.2\pm 1.4$ Myr 的估计值。在第二种方法中，通过分析恒星的瞬时速度，我们发现恒星系统在银河（xy）平面上发生了膨胀。基于这种效应，我们找到了从皮克托里斯运动群开始膨胀到现在的时间间隔，即（t=20/pm 2/）Myr。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

$Estimation of the Kinematic Age of the $\boldsymbol{\beta}$ Pictoris Moving Group from Up-to-date Data$

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Estimation of the Kinematic Age of the $\boldsymbol{\beta}$ Pictoris Moving Group from Up-to-date Data

The kinematics of about 40 single stars belonging to the $\beta$ Pictoris moving group is studied. The age of the $\beta$ Pictoris moving group is estimated from these stars with ground-based line-of-sight velocity determinations by two methods. Both estimates are kinematic. In the first method we considered the traceback trajectories of the stars, giving an estimate of $t=13.2\pm 1.4$ Myr. In the second method, by analyzing the instantaneous velocities of the stars, we show that there is an expansion of the stellar system occurring in the Galactic $xy$ plane. Based on this effect, we find the time interval elapsed from the beginning of the expansion of the $\beta$ Pictoris moving group to the present day, $t=20\pm 2$ Myr.

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来源期刊

Astronomy Letters-A Journal of Astronomy and Space Astrophysics 地学天文-天文与天体物理

CiteScore

1.70

自引率

22.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Astronomy Letters is an international peer reviewed journal that publishes the results of original research on all aspects of modern astronomy and astrophysics including high energy astrophysics, cosmology, space astronomy, theoretical astrophysics, radio astronomy, extragalactic astronomy, stellar astronomy, and investigation of the Solar system.