A NEW VLA–HIPPARCOS DISTANCE TO BETELGEUSE AND ITS IMPLICATIONS
A NEW VLA–HIPPARCOS DISTANCE TO BETELGEUSE AND ITS IMPLICATIONS
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DOI：
10.1088/0004-6256/135/4/1430
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
G. Harper;Alexander Brown;E. Guinan
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文献类型：
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作者：
G. Harper;Alexander Brown;E. Guinan
到M超巨星参宿四的距离鲜为人知，依巴谷视差有很大的不确定性。对于超巨星大气和风的详细数值研究，精确的距离是获得许多恒星参数可靠估计的先决条件。新的高空间分辨率，多波长，NRAO33国家射电天文台是美国国家科学基金会在联合大学公司的合作协议下运作的一个设施。得到了参宿四的甚大阵射电位置，并结合Hipparcos Catalogue中间天体测量数据，得到了新的天体测量解。这些新解表明视差更小，因此距离更大（197±45 pc），而不是原始的Hipparcos目录（131±30 pc）和修订后的Hipparcos缩减。他们还证实了在赤经和赤纬中较小的固有运动，正如以前的无线电观测发现的那样。我们研究了修订后的天体测量解对参宿四与其局部环境的相互作用、恒星特性和运动学的影响。我们发现，参宿四最可能的恒星形成场景是，它是一颗来自猎户座OB1星协的逃逸恒星，最初是猎户座OB1a内一个高质量多星系的成员。国家射电天文台是美国国家科学基金会在联合大学公司的合作协议下运作的一个设施。
The distance to the M supergiant Betelgeuse is poorly known, with the Hipparcos parallax having a significant uncertainty. For detailed numerical studies of M supergiant atmospheres and winds, accurate distances are a prerequisite to obtaining reliable estimates for many stellar parameters. New high spatial resolution, multiwavelength, NRAO33 The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Very Large Array (VLA) radio positions of Betelgeuse have been obtained and then combined with Hipparcos Catalogue Intermediate Astrometric Data to derive new astrometric solutions. These new solutions indicate a smaller parallax, and hence greater distance (197 ± 45 pc), than that given in the original Hipparcos Catalogue (131 ± 30 pc) and in the revised Hipparcos reduction. They also confirm smaller proper motions in both right ascension and declination, as found by previous radio observations. We examine the consequences of the revised astrometric solution on Betelgeuse's interaction with its local environment, on its stellar properties, and its kinematics. We find that the most likely star-formation scenario for Betelgeuse is that it is a runaway star from the Ori OB1 association and was originally a member of a high-mass multiple system within Ori OB1a. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.