排序方式: 共有20条查询结果,搜索用时 15 毫秒
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应用中国科学院云南天文台丽江天文观测站1.8 m望远镜及其折轴光谱仪,对18颗近太阳样本恒星进行了高色散光谱观测,获得这些恒星高质量的高色散光谱。表明原中国科学院国家天文台兴隆观测站2.16 m折轴光谱仪搬迁、改造获得成功,达到并超过了预期的效果。以丽江天文观测站1.8 m望远镜及其折轴光谱仪观测获得的高质量的高色散光谱为基础,应用高斯拟合方法测量了样本中17颗年轻类太阳恒星锂吸收线的等值宽度,并计算了锂元素丰度。应用Hall给出的经验公式,计算了这些年轻恒星的Ca ⅡΗ和Κ(λ=395.0 nm)辐射强度。讨论了锂元素丰度和表明恒星色球活动的Ca H和K线辐射强度之间的关系。发现锂元素丰度值高的年轻恒星,其Ca H和K线辐射更强。考虑到恒星自转速度随恒星年龄的变化,小质量主序前恒星随着恒星年龄的增加,自转明显的加快;主序恒星随着恒星年龄的增加,自转逐渐变慢。我们的结果支持恒星自转越快,其活动性也就越强,以及色球活动较强的恒星具有高的锂元素丰度值。 相似文献
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IRIS-ICP光谱仪点火故障分析 总被引:1,自引:0,他引:1
从ICP光谱仪点火系统的组成部分、工作原理、参数分析入手,分析不能正常点火故障及排除方法. 相似文献
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Zacarías Malacara Hernández Daniel Malacara-Hernández 《Optics and Lasers in Engineering》2011,49(6):749-752
An optical spectrograph for use in the OGS (Optical Ground Station), a 1 m telescope in Izaña Observatory (Tenerife, Spain) and the GTC telescope at Islas Canarias observatory has been designed, built and tested. The dispersive part was designed and built at the Centro de Investigaciones en Óptica, A.C. Due to requirements from Instituto Astrofísico de Canarias this Spectrograph has an f/5 collimator and camera with a plate factor of 6.55 nm/mm. Since the resolution of the system has to have a high resolution of the order of 15 μm or less, an apochromatic design was selected. This article describes this design and its main characteristics. 相似文献
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New compact Echelle spectrographs with multichannel time-resolved recording capabilities 总被引:1,自引:0,他引:1
Peter Lindblom 《Analytica chimica acta》1999,380(2-3):353-361
The paper describes a new type of Echelle spectrograph system that utilises a gated interline CCD camera. The system, that contains no moving parts, records simultaneously 6000 time-resolved spectral channels in the range 200–1100 nm with a lowest gate time of 100 ns and with a constant spectral resolution. Results from time-resolved recordings made both from a Xe-flash source and from laser induced breakdown, are presented. It is concluded that the gated CCD sensors are of great interest for applications in spectroscopy. They are of special interest for the application with Echelle spectrographs. The high resolution of the gatable CCD with 6.7×6.7 μm2 surpasses that of any ICCD today and in the foreseeable future. The gated CCD also opens the NIR wavelength region for time-resolved multichannel spectroscopy. 相似文献
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