Definition

Noun: A red dwarf star is a small, old, and relatively cool type of star. It is the most common type of star in the Milky Way galaxy. These stars have a mass much lower than that of the Sun, typically described as being approximately 100 times the mass of the planet Jupiter. Due to their low mass, they burn their fuel very slowly, resulting in extremely long lifespans and a dim, reddish glow.

Usage Examples

• Noun:
  • Proxima Centauri, the closest star to our Sun, is a red dwarf star.
  • Scientists are searching for planets orbiting red dwarf stars because their long lifespans could allow life to develop.
  • A red dwarf star is too faint to be seen with the naked eye from Earth.

Advanced Usage

• "M-dwarf": This is a common astronomical classification term that is essentially synonymous with red dwarf star. It refers to stars of spectral class M, which are the coolest and most common type.
  • The telescope survey focused on observing M-dwarf stars, another term for red dwarf stars, in our galactic neighborhood.

Variants and Related Words

• Red dwarf (n): A common shortened form of "red dwarf star."
  • Many exoplanets have been discovered around red dwarfs.
• M-dwarf (n): As noted above, a technical synonym based on stellar classification.
• Low-mass star (n): A broader category that includes red dwarf stars.

Synonyms

• M-dwarf: A star of spectral class M.
• Low-mass star: A star with a mass significantly less than the Sun's.

Related Terms and Concepts

• Main sequence star: Red dwarf stars are a type of main sequence star, meaning they are in the stable, hydrogen-burning phase of their life cycle.
• Brown dwarf: This is a different, substellar object that is less massive than a red dwarf star and does not sustain hydrogen fusion.
• Flare star: Some red dwarf stars are prone to sudden, dramatic increases in brightness called flares.

Noun

1. a small, old, relatively cool star; approximately 100 times the mass of Jupiter