装有ULTRASPEC的2.4米泰国国家望远镜的首次月球掩星结果
First Lunar Occultation Results from the 2.4 m Thai National Telescope equipped with ULTRASPEC
摘要：
最近落成的2.4米泰国国家望远镜（TNT）除其他仪器外，还配备了ULTRASPEC低噪声帧转移EMCCD照相机。在其第一个正式的观测季节结束时，我们报告使用该设施记录高时间分辨率的成像，使用小的探测器子阵列采样速度为几个$10^2$ \，Hz。特别是，我们记录了几颗恒星的月球掩星，这是东南亚用这类望远镜对这一研究领域的第一次贡献。在这些结果中，我们讨论了$α$ ~Cnc的精确测量，它以前曾被报道为可疑的密近双星。几位作者试图解决这颗恒星，但迄今为止缺乏明确的确认。通过我们的观测，我们能够对一个假定的伴星的投影角距（$<0\farcs003$）和亮度（$Δ{\rm m} > 5$）进行严格的限制。我们还提出了一个测量的二进制{HR~7072}，这大大扩展了时间覆盖范围，其尚未确定的轨道。我们讨论我们的精确测定的通量比和预计的分离的背景下，其他可用的数据。最后，我们提供了一个估计的性能ULTRASPEC在TNT月球掩星工作。该设施有助于在迄今为止没有可比资源的地理区域推广月球掩星技术。
英文摘要：
The recently inaugurated 2.4\,m Thai National Telescope (TNT) is equipped, among other instruments, with the ULTRASPEC low-noise, frame-transfer EMCCD camera. At the end of its first official observing season, we report on the use of this facility to record high time resolution imaging using small detector subarrays with sampling as fast as several $10^2$\,Hz. In particular, we have recorded lunar occultations of several stars which represent the first contribution to this area of research made from South-East Asia with a telescope of this class. Among the results, we discuss an accurate measurement of $α$~Cnc, which has been reported previously as a suspected close binary. Attempts to resolve this star by several authors have so far met with a lack of unambiguous confirmation. With our observation we are able to place stringent limits on the projected angular separation ($<0\farcs003$) and brightness ($Δ{\rm m} > 5$) of a putative companion. We also present a measurement of the binary {HR~7072}, which extends considerably the time coverage available for its yet undetermined orbit. We discuss our precise determination of the flux ratio and projected separation in the context of other available data. We conclude by providing an estimate of the performance of ULTRASPEC at TNT for lunar occultation work. This facility can help to extend the lunar occultation technique in a geographical area where no comparable resources were available until now.
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