star pair
star pair (binary star; double star) Binary stars are among the commonest stellar systems in our galaxy, accounting for about 50% of all stars. They consist of two stars in orbit around their common centre of gravity. Those which can be resolved by telescope are referred to as visual binaries. Spectroscopic binaries comprise star pairs too close to be resolved visually, but which exhibit Doppler shifts in spectral lines because of varying velocities of the two stars in the line of sight. Other stars reveal the presence of an invisible companion by changes in their proper motion. Double stars appear to be visually close to each other, but may be at vastly different distances from the observer.
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Star Anise , Star anise spectroscopic binary , spectroscopic binary See STAR PAIR. Hertzsprung-russell Diagram , Hertzsprung-Russell Diagram
A Hertzsprung-Russell diagram, or HR diagram, is a graph of stellar temperatures (plotted on the horizontal axis) and lum… Star Cluster , Star clusters are groups of stars that occur close to each other in space (and, thus, are gravitationally bound to one another), appear to have rough… Variable Star , Variable stars are stars that vary in brightness over time. In most cases, these changes occur very slowly over a period of months or even years. In… Double Star , double star Two stars that appear close together in the sky. There are two types of double star: binary stars and optical doubles (two stars that are…
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star pair