EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
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DOI：
10.1051/0004-6361/201321430
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发表时间：
2013-04
影响因子：
6.5
通讯作者：
J. Skottfelt;D. Bramich;R. Jaimes;U. Jørgensen;N. Kains;K. Harpsoe;C. Liebig;M. Penny;Khalid Al-Subai;J. M. Andersen;V. Bozza;P. Browne;S. Novati;Y. Damerdji;C. Diehl;Martin Dominik;A. Elyiv;E. Giannini;F. Hessman;T. Hinse;M. Hundertmark;D. Juncher;E. Kerins;H. Korhonen;L. Mancini;R. Martin;M. Rabus;S. Rahvar;G. Scarpetta;J. Southworth;C. Snodgrass;R. Street;J. Surdej;J. Tregloan-Reed;C. Vilela;A. Williams
中科院分区：
文献类型：
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作者：
J. Skottfelt;D. Bramich;R. Jaimes;U. Jørgensen;N. Kains;K. Harpsoe;C. Liebig;M. Penny;Khalid Al-Subai;J. M. Andersen;V. Bozza;P. Browne;S. Novati;Y. Damerdji;C. Diehl;Martin Dominik;A. Elyiv;E. Giannini;F. Hessman;T. Hinse;M. Hundertmark;D. Juncher;E. Kerins;H. Korhonen;L. Mancini;R. Martin;M. Rabus;S. Rahvar;G. Scarpetta;J. Southworth;C. Snodgrass;R. Street;J. Surdej;J. Tregloan-Reed;C. Vilela;A. Williams
在球状星团NGC 6981拥挤的中心区域中有两颗以前未知的变星。这些观测是使用位于智利拉西拉的丹麦1.54米望远镜的电子倍增CCD（EMCCD）相机进行的。这两个变星以前没有被传统的CCD成像探测到，因为它们靠近一颗明亮的星星。这一发现表明，EMCCD是一个强大的工具，执行高精度的时间序列测光在拥挤的领域和近明亮的星星，特别是当与差分图像分析（DIA）相结合。
Two previously unknown variable stars in the crowded central region of the globular cluster NGC 6981 are presented. The observations were made using the Electron Multiplying CCD (EMCCD) cameraat the Danish 1.54m Telescope at La Silla, Chile. The two variables were not previously detected by conventional CCD imaging because of their proximity to a bright star. This discovery demonstrates that EMCCDs are a powerful tool for performing high-precision time-series photometry in crowded fields and near bright s tars, especially when combined with difference image analysis (DIA).