Physics, 23.03.2020 19:33 cksbanks

You are observing a binary star system and obtain a series of spectra of the light from the two stars. In this spectrum, most of the absorption lines shift back and forth as expected from the Doppler Effect. A few lines, however, do not shift at all, but remain at the same wavelength. How can we explain the behavior of the non-shifting lines?

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You are observing a binary star system and obtain a series of spectra of the light from the two star...