- absolute luminosity
- абсолютная яркость
English-russian astronautics dictionary. - M.: Military Publishing house. Compiled by F. P. Suprun, K. V. Shirokov. 1964.
absolute luminosity
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
