2018年IAO实测高年组第7题-太阳光谱的标定

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英文题目

Calibration of solar spectrum. The spectrograph equipped with 45 cm cassegrain teltscpoe at Arthur C Clark observatory, Sri Lanka, observed the Sun. A part of the solar absorption specttum is shown in figure 7.1. The spectrum is colour inverted for the clarity of the spectral lines. The bottom line is the solar absorpition spectrum and the top line is the emission spectrum of Fe-Ne lamp. This emission spectrum is used for calibration of the solar spestrum. Both spectra are in same frame.

Figure 7.2. demonstrates solar absorption spectrum and the Fe-Ne smmission spectrum. The red line is solar absorption spectrum and black line is Fe-Ne emission spectrum. The wavelength in angstrom(Å) of few emission lines of Fe-Ne are given in the figure 7.2. Y axis is the normalized flux. Assume the X axis is pixels of the CCD image.

7.1. Copy the table 7. to your answer book and find out the corresponding pixel using the grid in figure and fill the table.

7.2. Plot the wavelength (Å) vs pxiels for the data in table 7.

7.3. Draw the best fit straight line through the data points.

7.4. Hence determine the wavelength of the marked absorption line (L1) in figure 7.2.

中文题目

太阳光谱的标定 用斯里兰卡Arthur C Clark 天文台45cm光谱望远镜观测太阳。figure 7.1中展示了一部分拍摄的太阳光谱。为了使谱线更清晰,对光谱进行了反色处理。下部的谱线是太阳的吸收谱,上部的谱线是Fe-Ne的发射谱。这条发射光谱用于校准太阳的光谱。两段光谱在同一幅图中。

Figure 7.2 给出了太阳的吸收谱和Fe-Ne的发射谱。红色的是太阳的吸收谱,黑色的是Fe-Ne的发射谱。Fiugre7.2标出几条Fe-Ne的发射线的波长(Å)。Y轴是归一化的流量。假设X轴是CCD的像素值。

7.1. 把table 7画在你的答题本上并利用图中的网格线读出相应的像素填在表格中。

7.2. 以波长(Å)为纵轴,像素为横轴,画出table 7中的数据。

7.3. 通过这些数据点画出最佳拟合直线。

7.4. 依此,在figure 7.2中标出吸收线(L1)的波长。