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18: Spectroscopic Binary Stars

Thumbnail: Algol B orbits Algol A. This animation was assembled from 55 images of the CHARA interferometer in the near-infrared H-band, sorted according to orbital phase. Image used with permission (CC BY-SA 3.0; Dr. Fabien Baron, Dept. of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090, labels indicating phase added by Stigmatella aurantiaca).