Pushing the Limits of Ground-based Photometric Precision: Submillimagnitude Time-Series Photometry of the Open Cluster NGC 6791
Pushing the Limits of Ground-based Photometric Precision: Submillimagnitude Time-Series Photometry of the Open Cluster NGC 6791
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突破地基光度精度的极限：疏散星团 NGC 6791 的亚毫米级时间序列光度测量
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
B. McLeod
中科院分区：
文献类型：
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作者：
J. Hartman;K. Stanek;B. Gaudi;M. Holman;B. McLeod
我们提出的结果，从三个晚上，时间序列研究疏散星团NGC 6791使用Megacam宽视场镶嵌CCD相机的6.5米MMT望远镜。这项研究的目的是证明有能力获得非常高的精度测光的大量恒星。我们对该星团中8000多颗14.3 < R < 20.1的恒星实现了优于1%的精度，对300多颗14.6 < R < 16.3的恒星实现了亚毫米级（低至0.36 mmag）精度。我们还发现了10颗新的变星，包括一颗振幅为2%的可能的δ Scuti变星，8颗可能的W Uma接触双星，以及一颗可能的RS CVn星星，我们还确定了7颗疑似低振幅变星，包括一颗振幅为4毫等的星星。我们评论这项研究的影响，地面为基础的调查过境行星小海王星。
We present the results from a three-night, time-series study of the open cluster NGC 6791 using the Megacam wide-field mosaic CCD camera on the 6.5 m MMT telescope. The aim of this study was to demonstrate the ability to obtain very high precision photometry for a large number of stars. We achieved better than 1% precision for more than 8000 stars with 14.3 < R < 20.1 and submillimagnitude (as low as 0.36 mmag) precision for over 300 stars with 14.6 < R < 16.3 in the field of this cluster. We also discovered 10 new variable stars, including a possible δ Scuti variable with an amplitude of 2%, eight likely W UMa contact binaries, and a possible RS CVn star, and we identified seven suspected low-amplitude variables, including one star with an amplitude of 4 mmag. We comment on the implications of this study for a ground-based survey for transiting planets as small as Neptune.