Binaire spectroscopique

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What Wikipedia says

Un système binaire spectroscopique est un couple d'objets dont le mouvement orbital est mis en évidence par la variation de la vitesse radiale d'une ou des deux composantes du système.

Excerpt from the Wikipedia article “Binaire spectroscopique”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Merikanto, CC BY-SA 4.0, via Wikimedia Commons.