luminosity distribution

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• luminosity function — noun a) A standard measure of the response of the human eye to light of different wavelengths b) A relative measure of the relationship between stellar magnitude and the distribution of stars between magnitudes …   Wiktionary

• luminosity curve — noun : a curve expressing the product of relative spectral energy distribution by visibility …   Useful english dictionary

• 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

• Eddington luminosity — The Eddington luminosity (also referred to as the Eddington limit) in a star is defined as the point where the gravitational force inwards equals the continuum radiation force outwards, assuming hydrostatic equilibrium and spherical symmetry.… …   Wikipedia

• Spectral power distribution — In color science, a spectral power distribution describes the power per unit area per unit wavelength of an illumination (radiant exitance), or more generally, the per wavelength contribution to any radiometric quantity (radiant energy, radiant… …   Wikipedia

• Globular cluster — s from the Sun and contains hundreds of thousands of stars. [cite news coauthors =The Hubble Heritage team url = http://hubblesite.org/newscenter/newsdesk/archive/releases/1999/26/ title = Hubble Images a Swarm of Ancient Stars work = HubbleSite… …   Wikipedia

• Surface brightness fluctuation — (SBF) is a secondary distance indicator used to estimate distances to galaxies. The technique uses the fact that galaxies are made up of a finite number of stars. The number of stars in any small patch of the galaxy will vary from point to point …   Wikipedia

• Brightest cluster galaxy — (BCG) is defined as the brightest galaxy in a cluster of galaxies. BCGs include the most massive galaxies in the universe. They are generally elliptical galaxies which lie close to the geometric and kinematical center of their host galaxy cluster …   Wikipedia

• Palomar 12 — Globular cluster name = Palomar 12 caption = Palomar 12 by Hubble Space Telescope, 3.36 prime; view epoch = J2000 class = XII constellation = Capricornus ra = RA|21|46|38.8cite web title=SIMBAD Astronomical Database work=Results for Palomar 12… …   Wikipedia

• NGC 1566 — A mid infrared image of NGC 1566 taken by the Spitzer Space Telescope (SST). Observation data (J2000 epoch) Constellation …   Wikipedia

• Terzan 7 — Globular cluster name = Terzan 7 caption = Terzan7 by Hubble Space Telescope; 3.5 prime; view credit = NASA/STScI/WikiSky epoch = J2000 class = constellation = Sagittarius ra = RA|19|17|43.70cite web title=SIMBAD Astronomical Database… …   Wikipedia