Useful english dictionary. 2012.
Mass–luminosity relation — In astrophysics, the mass–luminosity relation is an equation giving the relationship between a star s mass and its luminosity. The relationship is represented by the equation: where L⊙ and M⊙ are the luminosity and mass of the sun and… … Wikipedia
Luminosity — has different meanings in several different fields of science.In photometry and color imagingIn photometry, luminosity is sometimes incorrectly used to refer to luminance, which is the density of luminous intensity in a given direction. The SI… … Wikipedia
Mass-to-light ratio — In astrophysics and physical cosmology the mass to light ratio, normally designated with the symbol Υ[1] is the quotient between the total mass of a spatial volume (typically on the scales of a galaxy or a cluster) and its luminosity. These… … Wikipedia
Initial mass function — The initial mass function (IMF) is an empirical function that describes the mass distribution (the histogram of stellar masses) of a population of stars in terms of their theoretical initial mass (the mass they were formed with). The properties… … Wikipedia
Planetary nebula luminosity function — (PNLF) is a secondary distance indicator used in astronomy. It makes use of the [O III| [O III] λ5007 forbidden line found in all planetary nebula which are members of the old stellar populations (Population… … Wikipedia
magnitude — Synonyms and related words: Beehive, Cepheid variable, Hertzsprung Russell diagram, Hyades, Messier catalog, NGC, Pleiades, Seven Sisters, absolute magnitude, amount, ampleness, amplitude, area, bigness, binary star, black hole, body,… … Moby Thesaurus
Hyades — Synonyms and related words: Atlantides, Beehive, Cepheid variable, Hertzsprung Russell diagram, Messier catalog, NGC, Napaea, Pleiades, Seven Sisters, absolute magnitude, binary star, black hole, double star, dryad, dwarf star, fixed star, flower … Moby Thesaurus
Pleiades — Synonyms and related words: Atlantides, Beehive, Cepheid variable, Hertzsprung Russell diagram, Hyades, Messier catalog, NGC, Napaea, Seven Sisters, absolute magnitude, binary star, black hole, double star, dryad, dwarf star, fixed star, flower… … Moby Thesaurus
black hole — Synonyms and related words: Beehive, Cepheid variable, Hertzsprung Russell diagram, Hyades, Messier catalog, NGC, POW camp, Pleiades, Seven Sisters, absolute magnitude, bastille, binary star, borstal, borstal institution, bridewell, brig, cell,… … Moby Thesaurus
nova — Synonyms and related words: Beehive, Cepheid variable, Hertzsprung Russell diagram, Hyades, Messier catalog, NGC, Pleiades, Seven Sisters, absolute magnitude, binary star, black hole, double star, dwarf star, fixed star, giant star, globular… … Moby Thesaurus
