WIYN OPEN CLUSTER STUDY. LX. SPECTROSCOPIC BINARY ORBITS IN NGC 6819

WIYN OPEN CLUSTER STUDY. LX. SPECTROSCOPIC BINARY ORBITS IN NGC 6819
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DOI:
10.1088/0004-6256/148/2/38
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发表时间:
2014-07
期刊:
The Astronomical Journal
影响因子:
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通讯作者:
K. Milliman;R. Mathieu;A. Geller;N. Gosnell;S. Meibom;I. Platais
K. Milliman;R. Mathieu;A. Geller;N. Gosnell;S. Meibom;I. Platais
中科院分区:
其他
文献类型:
--
作者:
K. Milliman;R. Mathieu;A. Geller;N. Gosnell;S. Meibom;I. Platais

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我们介绍了对疏散星团 NGC 6819(2.5 Gyr)进行 WOCS 径向速度 (RV) 勘测的现状,其中包括 93 个光谱双星轨道,周期从 1.5 天到 8000 天不等。这些结果是我们使用 WIYN 3.5 m 望远镜上的 Hydra 多目标摄谱仪对 NGC 6819 进行的 RV 调查的结果。我们还对 NGC 6819 的多组光学光度测量进行了详细分析。在 1° 视场内,我们的恒星样本包括巨型分支、红色团块和蓝色散乱候选体,并延伸到主序 (MS) 关闭以下近 2 星等。对于我们调查中观察到的每颗恒星,我们提供所有 RV 测量值、平均 RV 和速度变化信息。此外,我们还讨论了样本中的著名双星,包括食双星(WOCS 23009、WOCS 24009 和 WOCS 40007)、开普勒星震学研究中指出的恒星(WOCS 4008、WOCS 7009 和 WOCS 8007)以及过去蓝色落后者的潜在后代(WOCS 1006 和 WOCS) 6002)。我们发现所有周期小于 104 天的 MS 双星的不完整性校正双星分数为 22% ± 3%,NGC 6819 的潮汐环化周期为天。
We present the current state of the WOCS radial-velocity (RV) survey for the rich open cluster NGC 6819 (2.5 Gyr) including 93 spectroscopic binary orbits with periods ranging from 1.5 to 8000 days. These results are the product of our ongoing RV survey of NGC 6819 using the Hydra Multi-Object Spectrograph on the WIYN 3.5 m telescope. We also include a detailed analysis of multiple prior sets of optical photometry for NGC 6819. Within a 1° field of view, our stellar sample includes the giant branch, the red clump, and blue straggler candidates, and extends to almost 2 mag below the main sequence (MS) turnoff. For each star observed in our survey we present all RV measurements, the average RV, and velocity variability information. Additionally, we discuss notable binaries from our sample, including eclipsing binaries (WOCS 23009, WOCS 24009, and WOCS 40007), stars noted in Kepler asteroseismology studies (WOCS 4008, WOCS 7009, and WOCS 8007), and potential descendants of past blue stragglers (WOCS 1006 and WOCS 6002). We find the incompleteness-corrected binary fraction for all MS binaries with periods less than 104 days to be 22% ± 3% and a tidal circularization period of days for NGC 6819.