Question

How can astrono-
mers detect a binary star if only one of the
two stars is visible from Earth?​

Answer 1

Respuesta:

Spectroscopy. By breaking up the starlight into a rainbow, astronomers can detect absorption lines, corresponding to different elements in the star's atmosphere. As the star orbits the binary system barycenter, it alternately moves towards and away from Earth. ... You look at the star and see if it moves in the sky.

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