luminosity classification

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• luminosity class — Astron. a classification of stars of a given spectral type according to their luminosity, breaking them down into dwarfs, giants, and supergiants. * * * …   Universalium

• luminosity class — Astron. a classification of stars of a given spectral type according to their luminosity, breaking them down into dwarfs, giants, and supergiants …   Useful english dictionary

• Stellar classification — In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are… …   Wikipedia

• stellar classification — ▪ astronomy       scheme for assigning stars (star) to types according to their temperatures as estimated from their spectra. The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard… …   Universalium

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• Hertzsprung-Russell diagram — The Hertzsprung Russell diagram (usually referred to by the abbreviation H R diagram or HRD, also known as a colour magnitude diagram, or CMD) shows the relationship between absolute magnitude, luminosity, classification, and effective… …   Wikipedia

• Red dwarf — According to the Hertzsprung Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type. They constitute the vast majority of stars and have a mass of less than one half that of… …   Wikipedia

• Galaxie (Voie Lactée) — Voie lactée Pour les articles homonymes, voir Voie lactée (homonymie) et Galaxie (homonymie). Voie lactée …   Wikipédia en Français

• Galaxie (Voie lactee) — Voie lactée Pour les articles homonymes, voir Voie lactée (homonymie) et Galaxie (homonymie). Voie lactée …   Wikipédia en Français

• Galaxie (Voie lactée) — Voie lactée Pour les articles homonymes, voir Voie lactée (homonymie) et Galaxie (homonymie). Voie lactée …   Wikipédia en Français

• Galaxie de la Voie lactée — Voie lactée Pour les articles homonymes, voir Voie lactée (homonymie) et Galaxie (homonymie). Voie lactée …   Wikipédia en Français