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| 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 Picture Stats: Views: 762 Filesize: 185.64kB Height: 897 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18398 |