The difference between Double star and Double star system
When used as nouns, double star means two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields, whereas double star system means a binary star.
check bellow for the other definitions of Double star and Double star system
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Double star as a noun (star):
Two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a binary star.
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Double star as a noun (star):
Two stars that appear to be one when seen with the naked eye, either because they orbit one another (binary stars) or happen to be in the same line of sight even though they are separated by a great distance (optical binaries).
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Double star system as a noun (star):
a binary star