Photometric error in mid-infrared observations at the TAO site caused by short-term variation of atmospheric water vapor

Photometric error in mid-infrared observations at the TAO site caused by short-term variation of atmospheric water vapor
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大气水汽短期变化引起的TAO站点中红外观测光度误差

DOI:
10.1117/12.2311778
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发表时间:
2018
期刊:
Ground-based and Airborne Instrumentation for Astronomy VII
影响因子:
--
通讯作者:
and Yutaka Yoshida
and Yutaka Yoshida
中科院分区:
--
文献类型:
--
作者:
Masahito S. Uchiyama;Takashi Miyata;Ryou Ohsawa;Takafumi Kamizuka;Shigeyuki Sako;Jumpei Yamaguchi;Tomohiro Mori;and Yutaka Yoshida

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在地基中红外观测中,大气水汽的时间变化是实现精确测光的一个重要问题。长期(~分钟或小时)的变化已经知道,但短期(~秒)的变化还没有量化在以前的研究。我们利用实际的天文观测资料,对这种短期变化和TAO站中红外观测中的光度误差进行了评估。估计的光度误差通常小于1%,但在15种情况中的两种情况下显示2-5%。这表明水汽的短期变化是限制地基中红外观测测光精度的因素之一。
Time variation of the atmospheric water vapor is an important problem to achieve accurate photometry in ground-based mid-infrared observations. Long-term (~ minutes or hours) variation has been already known, but short-term (~ seconds) variation has not been quantified in previous studies. We evaluate this short-term variation and the photometric error in the mid-infrared observations at the TAO site by using actual astronomical data. Estimated photometric errors are typically less than 1% but show 2-5% in two of fifteen cases. This suggests that the short-term variation of the water vapor is one of the factors which limit the photometric accuracy in ground based mid-infrared observations.
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