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文摘
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主要介绍了抚仙湖1m新真空太阳望远镜(the 1-meter New Vacuum Solar Telescope,NVST)6m水平式近红外光谱仪的安装过程和实测结果。主要讨论内容是光路设计特点、光学系统的装调以及利用该光谱仪对活动区NOAA 11662黑子进行的初步近红外光谱实测(波长1.56 μm附近)。成功观测到由黑子强磁场造成的Fe I 1.56 μm谱线裂变现象,并初步估算了磁场强度。该光谱的成功装调和使用,充分实现了对9m光谱仪光学系统的整体检测,为9 m光谱仪的安装调试提供了宝贵的经验和参考。 |
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其他语种文摘
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This paper first presents the design, layout, and installation of a near-infrared grating spectrograph installed on the 1m new vacuum solar telescope in the Fuxian-Lake Solar-Observation Station of the Yunnan Observatories. It records spectra in the wavelength range of 1.0μm-2.0μm. The focal length of its collimating mirror is 6m and its spectral resolution can reach about 6x 10~(-6)μm/pixel. Using this spectrograph and a previously built near-infrared detector (with an InGaAs detector of 512x640 pixels and a pixel size of 25 μm) we can obtain solar spectra with a wavelength coverage of 0. 004μm. One purpose of making this horizontal-type spectrograph is to evaluate main designs to be used in the vertical-type 9m near-infrared spectrograph in future. The designs include those of the Echelle grating, infrared detector, and infrared front-filter. With the spectrograph we can also accumulate experience of observing near-infrared solar spectra, particularly, in setting the slit width, exposure time, and wavelength calibration. Using the spectrograph we successfully observed a sunspot region in a wavelength range around 1.565 μm. This range covers two commonly studied spectral lines (Fe I 1.5648μm and Fe I 1.5653μm),which are sensitive to solar magnetic-field strengths. We reduced the data using codes designed for the 1m telescope. The wavelength calibration is based on the standard solar spectrum. We calculated the magnetic-field strength (instead of the magnetic-field flux) from the line split rather straightforwardly. These preliminary results demonstrate the effectiveness of this 6m spectrograph in achieving its scientific goals. |
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来源
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天文研究与技术
,2014,11(2):168-175 【扩展库】
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关键词
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光谱仪
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近红外
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抚仙湖1 m新真空太阳望远镜
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地址
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中国科学院云南天文台, 云南, 昆明, 650011
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-7673 |
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学科
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天文学 |
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基金
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国家自然科学基金
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西部之光项目“抚仙湖一米红外太阳塔红外大色散光谱仪研制”
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物质科学前沿与交叉研究II “红外太阳物理”
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文献收藏号
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CSCD:5112464
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