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SlideshowReport

Spectral Line Motion in Binary Star Systems

Description
Spectral Line Motion in Binary Star Systems
The graph displays the radial-velocity curves of the binary HD 171978. (The HD means that this is a star from the Henry Draper
Catalogue of stars.) The entire binary is moving away from us at 12 km/s, which is why the pattern of radial-velocity curves
is displaced upward from the zero-velocity line
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