论文标题

基于GAIA DR2数据的VDB 130群集恒星内容的修订。星际灭绝向CYG OB1超壳

A revision of the vdB 130 cluster stellar content based on GAIA DR2 Data. Interstellar extinction toward the Cyg OB1 supershell

论文作者

Sitnik, T. G., Rastorguev, A. S., Tatarnikova, A. A., Tatarnikov, A. M., Egorov, O. V., Tatarnikov, A. A.

论文摘要

研究了两个星形的区域:年轻的嵌入式开放群集VDB 130和位于CYG OB1关联周围扩展的超球壳壁的彗星分子云的头部和尾部观察到的原始群集邻域。 GAIA DR2目录用于验证VDB 130群集的恒星组成,其成员使用UCAC4目录进行了选择。 VDB 130成员的新样本包含68颗恒星,其近距离运动(在1个MAS YR $^{ - 1} $之内)和Close Trigonometric Parallaxes(从0.50到0.70 MAS)。显示相对视差误差会随着对象的距离而增加,并取决于其大小。在1.5-2 kpc的距离下,明亮和微弱的恒星分别为3-7%和20-30%。集群不超过〜10 Myr。在俄罗斯望远镜上进行的新光谱和光度观测结果与Gaia DR2结合使用,以在原始群集区域搜索光学组件 - 一种新的Starburst。对原始群集附近20颗恒星的分析表明,没有适当的运动或视差的浓度。根据光谱,光度法和三角估计,这些恒星的距离范围为0.4至2.5 kpc,并且根据法律,表现出颜色过量的距离,颜色过剩会随着距离D(kpc)而增加:$ e(b-e(b-v)\ simeq 0.6 \ simeq 0.6 \ times d $ mag。

Two star-forming regions are studied: the young embedded open cluster vdB 130 and the protocluster neighbourhood observed in the head and tail of the cometary molecular cloud located in the wall of the expanding supershell surrounding the Cyg OB1 association. The GAIA DR2 catalogue is employed to verify the stellar composition of the vdB 130 cluster whose members were earlier selected using the UCAC4 catalogue. The new sample of vdB 130 members contains 68 stars with close proper motions (within 1 mas yr$^{-1}$) and close trigonometric parallaxes (ranging from 0.50 to 0.70 mas). The relative parallax error is shown to increase with distance to objects and depend on their magnitude. At a distance of 1.5-2 kpc it is of about 3-7 per cent and 20-30 per cent for bright and faint stars, respectively. The cluster is not older than ~10 Myr. New spectroscopic and photometric observations carried out on Russian telescopes are combined with GAIA DR2 to search for optical components in the protocluster region - a new starburst. An analysis of 20 stars in the vicinity of the protocluster revealed no concentration of either proper motions or parallaxes. According to spectroscopic, photometric, and trigonometric estimates, the distances to these stars range from 0.4 to 2.5 kpc, and colour excess is shown to increase with a distance D (kpc) in accordance with the law: $E(B-V)\simeq 0.6\times D$ mag.

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