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- Binary_star abstract "A binary star is a star system consisting of two stars orbiting around their common center of mass. The more massive star is called the primary and the other is its companion star, 16x comes /ˈkoʊmiːz/, or secondary. Systems of two, three, four, or even more stars are called multiple star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as double (or more) by other means. Research over the last two centuries suggests that half or more of visible stars are part of multiple star systems.The term double star is often used synonymously with binary star; however, double star can also mean optical double star. Optical doubles are so called because the two stars appear close together in the sky as seen from the Earth; they are almost on the same line of sight. Nevertheless, their "doubleness" depends only on this optical effect; the stars themselves are distant from one another and share no physical connection. A double star can be revealed as optical by means of differences in their parallax measurements, proper motions, or radial velocities. Most known double stars have not been studied sufficiently closely to determine whether they are optical doubles or they are doubles physically bound through gravitation into a multiple star system.Binary star systems are very important in astrophysics because calculations of their orbits allow the masses of their component stars to be directly determined, which in turn allows other stellar parameters, such as radius and density, to be indirectly estimated. This also determines an empirical mass-luminosity relationship (MLR) from which the masses of single stars can be estimated.Binary stars are often detected optically, in which case they are called visual binaries. Many visual binaries have long orbital periods of several centuries or millennia and therefore have orbits which are uncertain or poorly known. They may also be detected by indirect techniques, such as spectroscopy (spectroscopic binaries) or astrometry (astrometric binaries). If a binary star happens to orbit in a plane along our line of sight, its components will eclipse and transit each other; these pairs are called eclipsing binaries, or, as they are detected by their changes in brightness during eclipses and transits, photometric binaries.If components in binary star systems are close enough they can gravitationally distort their mutual outer stellar atmospheres. In some cases, these close binary systems can exchange mass, which may bring their evolution to stages that single stars cannot attain. Examples of binaries are Sirius and Cygnus X-1 (Cygnus X-1 being a well known black hole). Binary stars are also common as the nuclei of many planetary nebulae, and are the progenitors of both novae and type Ia supernovae.".
- Binary_star thumbnail Sirius_A_and_B_Hubble_photo.jpg?width=300.
- Binary_star wikiPageExternalLink dsl.html.
- Binary_star wikiPageExternalLink VisualDoubleStars.
- Binary_star wikiPageExternalLink binary_stars.html.
- Binary_star wikiPageExternalLink multiple%20star%20systems.
- Binary_star wikiPageExternalLink Algol.
- Binary_star wikiPageExternalLink ejaavso401467.
- Binary_star wikiPageExternalLink barr1908.htm.
- Binary_star wikiPageExternalLink binaries.htm.
- Binary_star wikiPageExternalLink gallery.php?gallery=Stars2.
- Binary_star wikiPageID "52713".
- Binary_star wikiPageRevisionID "606589643".
- Binary_star hasPhotoCollection Binary_star.
- Binary_star subject Category:Binary_stars.
- Binary_star subject Category:Exoplanetology.
- Binary_star subject Category:Star_types.
- Binary_star comment "A binary star is a star system consisting of two stars orbiting around their common center of mass. The more massive star is called the primary and the other is its companion star, 16x comes /ˈkoʊmiːz/, or secondary. Systems of two, three, four, or even more stars are called multiple star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as double (or more) by other means.".
- Binary_star label "Binary star".
- Binary_star label "Doppelstern".
- Binary_star label "Dubbelster".
- Binary_star label "Estrela binária".
- Binary_star label "Estrella binaria".
- Binary_star label "Gwiazda podwójna".
- Binary_star label "Stella binaria".
- Binary_star label "Étoile binaire".
- Binary_star label "Двойная звезда".
- Binary_star label "نجم ثنائي".
- Binary_star label "聯星".
- Binary_star label "連星".
- Binary_star sameAs Dvojhvězda.
- Binary_star sameAs Doppelstern.
- Binary_star sameAs Estrella_binaria.
- Binary_star sameAs Izar_bitar.
- Binary_star sameAs Étoile_binaire.
- Binary_star sameAs Bintang_biner.
- Binary_star sameAs Stella_binaria.
- Binary_star sameAs 連星.
- Binary_star sameAs 쌍성.
- Binary_star sameAs Dubbelster.
- Binary_star sameAs Gwiazda_podwójna.
- Binary_star sameAs Estrela_binária.
- Binary_star sameAs m.0dvmx.
- Binary_star sameAs Q50053.
- Binary_star sameAs Q50053.
- Binary_star wasDerivedFrom Binary_star?oldid=606589643.
- Binary_star depiction Sirius_A_and_B_Hubble_photo.jpg.
- Binary_star isPrimaryTopicOf Binary_star.
