High-speed ultracam colorimetry of the subdwarf B star SDSS J171722.08+58055.8
High-speed ultracam colorimetry of the subdwarf B star SDSS J171722.08+58055.8
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亚矮星 B 星的高速 Ultracam 比色法 SDSS J171722.08 58055.8
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Groot
中科院分区：
文献类型：
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作者：
C. Aerts;C. Jeffery;V. Dhillon;T. Marsh;P. Groot
我们展示了一颗微弱的次矮B星SDSS J171722.08+58055.8 （m B=16.7等）的高速多色光度测量，这颗恒星最近被发现是脉动的。这些数据是在2004年8月连续两个晚上使用附在4.2米威廉赫歇尔望远镜上的三通道分光光度计Ultracam获得的。我们确认这颗恒星在振荡，并将主频率细化到6.960兆赫。第二个新频率为7.267 mHz。这两个频率在所有三种颜色中都是显著的，在bb0 - 5sigma水平，并且在三种颜色中相位不同。我们尝试通过振幅比来识别最强模态，但没有成功。
We present high-speed multicolour photometry of the faint sub-dwarf B star SDSS J171722.08+58055.8 (m B=16.7 mag), which was recently discovered to be pulsating. The data were obtained during two consecutive nights in 2004 August using the three-channel photometer Ultracam attached to the 4.2 m William Herschel Telescope. We confirm the star to be oscillating and we refine the dominant frequency to 6.960 mHz. A second new frequency of 7.267 mHz was discovered. Both frequencies are significant in all three colors at level >5sigma and vary in phase in the three colors. We attempted mode identification for the strongest mode from its amplitude ratios but did not succeed.