分光双星,光谱双星 spectroscopic binary 一种双星系统。这种双星系统靠得很近,用望远镜都无法分辨出来,但是从双星的光谱可以看出有二组属恆星光谱。
若存在一个双星系统,两颗恒星均看不见,你能得到双星的光谱,然后在光谱中看到,双星的多普勒顿移。
If you have a binary system whereby both stars are visible so you get the spectrum of both stars, then you see the Doppler shift of both stars in the spectrum.
这个光谱a,顶上的光谱,是一颗恒星的,在双星系统中,周期是20。5天。
And this spectrum a, the top spectrum, is of a star, a binary system, that has a period of 20.5 days.
天空中一半的恒星,都是双星,看光谱的时候,你们会发现,它们绕着彼此转动。
Half of all the stars in the sky are binaries, and so when you look at the spectra, you will see them go around each other.
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