double and multiple stars.
Many stars like Aldebaran, Antares, Rigel, Polaris, etc at first glance appear as a single point of light, observed telecospio are formed by two or more stars next to each other. These stars are called double if two triples if they are three, and if more, they are called, in general, multiple.
double stars are divided into:
1) optical Doubles: When are composed of two stars located far distiancia independently of one another and who are next projected on the celestial sphere by the effect of perspective.
2) physical or binary Doubles: When between the two stars there is physical linkage, that is, they spin around each other under the laws of Kepler and Newton, forming a binary system.
In some double stars, the components are so close that even with the most powerful telescopes they appear as single stars and are known to be double by spectral analysis, or by the darker eclipses of the components produced wholly or partly the brighter the star appear as a variable, such as the star Agol. Among the stars
triples have to Regulus, including Lyra multiple.
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