absolute luminosity


absolute luminosity
видность при дневном зрении

English-russian dictionary of physics. 2013.

Смотреть что такое "absolute luminosity" в других словарях:

  • 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

  • Luminosity distance — DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.: M = m 5 (log {10}{D L} 1)!,which gives:: D L = 10^{frac{(m M)}{5}+1}where DL is measured in parsecs. For nearby… …   Wikipedia

  • Absolute magnitude — In astronomy, absolute magnitude (also known as absolute visual magnitude) is the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, 1 AU, or 100 km depending on object type) away from the observer,… …   Wikipedia

  • absolute magnitude — noun Date: 1902 a measure of the intrinsic luminosity of a celestial body (as a star) expressed as the apparent magnitude the body would have if viewed from a distance of 10 parsecs …   New Collegiate Dictionary

  • period-luminosity relation — /pear ee euhd looh meuh nos i tee/, Astron. the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars. [1945 50] * * * …   Universalium

  • mass-luminosity law — ˈ ̷ ̷| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ ̷ ̷ noun : a statement in astronomy: there is a close correlation between the luminosities or absolute magnitudes of stars and their masses so that the more massive stars are in general the more luminous …   Useful english dictionary

  • period-luminosity law — noun : a law in astronomy: the period of light variation of a Cepheid variable is in direct relation with its absolute magnitude whereby intrinsically fainter stars have the shorter periods …   Useful english dictionary

  • spectrum-luminosity diagram — noun : a graph with the spectral type of each star plotted as the abscissa and the absolute magnitude as the ordinate …   Useful english dictionary

  • period-luminosity relation — /pear ee euhd looh meuh nos i tee/, Astron. the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars. [1945 50] …   Useful english dictionary

  • Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …   Universalium

  • star cluster — Astron. a number of stars of common origin held together as a group by gravitational attraction. Cf. globular cluster, open cluster, stellar association. * * * ▪ astronomy Introduction  either of two general types of stellar assemblages held… …   Universalium