For the hip hop group, see Binary Star (hip hop group).
The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separate stars, 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, together with other binaries that change brightness as they orbit, photometric binaries.
If components in binary star systems are close enough they can gravitationally distort each other's 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.
A binarystar or binarystar system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night...
Planets in binarystar systems may be candidates for supporting extraterrestrial life. Habitability of binarystar systems is determined by many factors...
digital outlets. An action role-playing game, titled Made in Abyss: BinaryStar Falling into Darkness (メイドインアビス 闇を目指した連星, Made in Abyss: Yami o Mezashita...
bodies (such as comets). A star system of two stars is known as a binarystar, binarystar system or physical double star. If there are no tidal effects...
In astronomy, a contact binary is a binarystar system whose component stars are so close that they touch each other or have merged to share their gaseous...
optical telescopes. This occurs because the pair either forms a binarystar (i.e. a binary system of stars in mutual orbit, gravitationally bound to each...
An Interacting binarystar is a type of binarystar in which one or both of the component stars has filled or exceeded its Roche lobe. When this happens...
paradox, where the most-evolved star in a system is the least massive. The evolution of binarystar and higher-order star systems is intensely researched...
considered a binary because they are different kinds of objects. Astronomy portal Binary asteroid Binarystar Contact binary Contact binary (small Solar...
astronomy, the binary mass function or simply mass function is a function that constrains the mass of the unseen component (typically a star or exoplanet)...
of two stars caused by stellar dynamics within a star cluster, or by the orbital decay of a binarystar due to stellar mass loss or gravitational radiation...
System. It is thought that most black holes are solitary, but black holes in binary or larger systems are much easier to detect. Solitary black holes can generally...
twice as bright as Canopus, the next brightest star. Sirius is a binarystar consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A...
holes themselves, binary black holes are often divided into stellar binary black holes, formed either as remnants of high-mass binarystar systems or by dynamic...
A symbiotic binary is a type of binarystar system, often simply called a symbiotic star. They usually contain a white dwarf with a companion red giant...
high-mass X-ray binaries (HMXB), a pulsar with a massive star. Binary pulsars: a pulsar with a binary companion, often a white dwarf or neutron star. X-ray tertiary...
disc is one which orbits around the secondary (i.e. less massive) star of the binarystar system. This type of disc will only form when a high enough level...
A visual binary is a gravitationally bound binarystar system that can be resolved into two stars. These stars are estimated, via Kepler's third law,...
suns set. Hal Clement's 1957 novel Cycle of Fire depicts a planet in a binarystar system where the seasons last for decades and different species dominate...
envelope (CE) is gas that contains a binarystar system. The gas does not rotate at the same rate as the embedded binary system. A system with such a configuration...
Pontiac, Michigan. He is well respected for being one half of the rap duo BinaryStar, and has released a number of well-received solo albums. He is a member...
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