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Stellar kinematics
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In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate
Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate μ radian/s, that is, μ = vt / d with vt = the component of velocity transverse to line of sight from the Sun. (The diagram illustrates an angle μ swept out in unit time at tangential velocity vt.)
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in thes
Four runaway stars moving through regions of dense interstellar gas and creating bright bow waves and trailing tails of glowing gas. The stars in these NASA Hubble Space Telescope images are among 14 young runaway stars spotted by the Advanced Camera for Surveys between October 2005 and July 2006.
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Positions and trajectories of 20 high-velocity stars as reconstructed from data acquired by Gaia, overlaid on top of an artistic view of the Milky Way
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.
Runaway star speeding from 30 Doradus. Image taken by the Hubble Space Telescope.
Binary star
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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 or astrometry. 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.
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 bot
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
Edge-on disc of gas and dust present around the binary star system HD 106906
Edge-on disc of gas and dust present around the binary star system HD 106906
Artist's conception of a cataclysmic variable system
Artist's conception of a cataclysmic variable system
Artist's impression of the binary star system AR Scorpii
Artist's impression of the binary star system AR Scorpii