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Distance and Tangential Velocity of the Main Ionizing Star in the North America/Pelican Nebulae with Gaia EDR3
Research Notes of the AAS Pub Date : 2020-12-14 , DOI: 10.3847/2515-5172/abd18a
Michael A. Kuhn , Lynne A. Hillenbrand

The Bajamar Star is an early O star that ionizes the North America/Pelican Nebulae. In projection, it is near the geometric center of the H ii region, but appears to lie outside any of the main stellar subgroups. Furthermore, in Gaia DR2, there were slight discrepancies between this star and the rest of the system in parallax (2σ larger) and relative tangential velocity (∼6 km s−1). Using Gaia EDR3, we find that the parallax discrepancy has disappeared, but the velocity difference remains. These results are consistent with the star having escaped from a subgroup.



中文翻译:

带有盖亚EDR3的北美/鹈鹕星云中主要电离星的距离和切向速度

Bajamar星是一个早期的O星,它使北美/鹈鹕星云电离。在投影中,它靠近H ii区域的几何中心 ,但似乎位于任何主要的恒星亚组之外。此外,在盖亚(Gaia)DR2中,该恒星与系统其余部分之间在视差(较大)和相对切向速度(〜6 km s -1)之间存在细微差异。使用Gaia EDR3,我们发现视差差异已经消失,但速度差仍然存在。这些结果与恒星从一个子群中逃脱是一致的。

更新日期:2020-12-14
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