Binary star
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A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, 
comes , or secondary. Research between the early 19th century and today suggests that many stars are part of either binary star systems or star systems with more than two stars, called multiple star systems. The term double star may be used synonymously with binary star, but more generally, a double star may be either a binary star or an optical double star which consists of two stars with no physical connection but which appear close together in the sky as seen from the Earth. A double star may be determined to be optical if its components have sufficiently different proper motions or radial velocities, or if parallax measurements reveal its two components to be at sufficiently different distances from the Earth. Most known double stars have not yet been determined to be either bound binary star systems or optical doubles.
- Related: 104 Aquarii, 107 Aquarii, Beta Centauri, Binary stars in fiction, Binary system (astronomy), HD 30453
| The Double Star Library The Double Star Library ad.usno.navy.mil/wds/dsl.html - Web |
| ianridpath.com: List of the best visual binaries ianridpath.com: List of the best visual binaries www.ianridpath.com/binaries.htm - Web |
| Pictures of binaries at Hubblesite.org Pictures of binaries at Hubblesite.org hubblesite.org/.../ - Web |
Gallery for «Binary star»
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| Chandra X-ray Observatory Chandra X-ray Observatory chandra.harvard.edu/xray_sources/binary_stars.html - Web |
| An extensive simulation for the Algol system by No... An extensive simulation for the Algol system by North Carolina State University wonka.physics.ncsu.edu/Astro/Research/Algol/ - Web |
| Selected visual double stars and their relative po... Selected visual double stars and their relative position as a function of time astroclub.tau.ac.il/ephem/VisualDoubleStars/ - Web |
| Artistic representations of binary stars by Mark A... Artistic representations of binary stars by Mark A. Garlick www.space-art.co.uk/gallery.php?gallery=Stars2 - Web |
| Orbits and Velocity Curves of Spectroscopic Binari... Orbits and Velocity Curves of Spectroscopic Binaries, J. Miller Barr (1908) www.datasync.com/~rsf1/barr1908.htm - Web |
