New narrow-band filter system for the IRSF 1.4m telescope
New narrow-band filter system for the IRSF 1.4m telescope
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用于 IRSF 1.4m 望远镜的新型窄带滤光片系统
DOI：
10.1117/12.2576307
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Ebisawa Ken
中科院分区：
文献类型：
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作者：
Morihana Kumiko;Nagayama Takahiro;Tsujimoto Masahiro;Yamagishi Mitsuyoshi;Ebisawa Ken
窄带滤光片可以同时检测视场中多个光源的发射和吸收线特征，而无需光谱学。然而，从不同光谱斜率的源中估计和减去连续谱分量是困难的，特别是当目标线的等效宽度很小时。例如，激变变星的氢复合发射线的等效宽度约为-10至-100埃，但迄今为止，许多已被传统NB滤光片检测到的氢复合发射线具有较大的等效宽度。因此，我们构建了新型窄带滤光片，其透射带位于Paβ（1.282 µm）和Brγ（2.167 µm）发射线中心波长的两侧，这样我们就可以比仅在目标线一侧透射的传统滤光片更准确地评估连续谱水平。我们将窄带滤光片安装到南非天文台（SAAO）红外巡天设施（IRSF）望远镜的三色同步红外无偏巡天成像仪（SIRIUS）上，并对其性能进行了评价。我们发现，窄带滤波器可以检测到几十埃的等效宽度的发射线功能。因此，该滤波器组对于检测来自具有小等效宽度的目标的发射线特征是有用的，所述小等效宽度已经难以用常规NB滤波器组检测。
Narrow-band filters can detect emission and absorption line features from multiple sources in a field of view simultaneously without spectroscopy. However, it is difficult to estimate and subtract the continuum component from sources of different spectral slope, especially when the equivalent width of the target lines is small. For example, Cataclysmic Variables have equivalent widths of hydrogen recombination emission lines of about–10 to–100 angstroms, but many of the ones that have been detected by conventional NB filters so far have a large equivalent width. We have therefore constructed novel narrow-band filters with transmission bands on both sides of the central wavelengths of the Paβ (1.282 µm) and Brγ (2.167 µm) emission lines so that we can evaluate the continuum level more accurately than the conventional filters having transmission in only one side of the target line. We installed the narrow-band filters to the Simultaneous three-color InfraRed Imager for Unbiased Survey (SIRIUS) in the InfraRed Survey Facility (IRSF) telescope at South African Astronomical Observatory (SAAO), and evaluated their performance. We found that the narrow-band filters can detect emission line features with an equivalent width of several tens of angstroms. Thus, this filter set is useful for detecting emission line features from targets with small equivalent widths that have been difficult to detect with the conventional NB filter set.