double star

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Thân thiện
Definition
  1. Noun:
    • A system of two stars that revolve around each other under their mutual gravitation: A "double star" is a pair of stars that appear close together in the sky and are physically connected by gravity, orbiting a common center of mass.
Usage
  • The term "double star" is used in astronomy to describe a binary star system. It is important to distinguish it from stars that merely appear close together from our viewpoint but are not gravitationally bound (which are called "optical doubles").
Examples
  • Noun:
    • Through the telescope, we observed a beautiful double star in the constellation Cygnus.
    • Astronomers study double stars to understand stellar masses and orbits.
Advanced Usage

  • "Visual double star": A pair of stars that can be seen as separate through a telescope.

    • Albireo is a famous visual double star, with components of contrasting colors.

  • "Spectroscopic double star": A pair of stars so close they can only be distinguished by analyzing their combined light spectrum.

    • The star was identified as a spectroscopic double star after detailed spectral analysis.
Variants and Related Words

  • Binary star: A more precise synonym for a gravitationally bound double star system.

    • A binary star is a type of double star.

  • Optical double: Two stars that appear close together in the sky by chance but are not gravitationally related.

    • That pair is merely an optical double, not a true double star system.
Synonyms
  • Binary star: A system of two stars orbiting each other.
  • Binary system: A general term for any system of two objects orbiting a common center of mass, often used for stars.
Related Phrases

  • "Eclipsing binary": A type of double star where, from Earth, one star periodically passes in front of the other, causing a dip in brightness.

    • Algol is a well-known eclipsing binary.

  • "Close binary": A double star system where the two stars are very near to each other.

    • In a close binary, material can transfer from one star to the other.
Noun
  1. a system of two stars that revolve around each other under their mutual gravitation

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