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Luminosity

In physics, luminosity is the density of luminous intensity in a given direction.
In astronomy, luminosity is the amount of energy a body radiates in unit time. Stellar luminosities are usually expressed as solar luminosities, L; that is, how many times more energy the object radiates in comparison to the Sun. In X-ray and radio wavelengths, luminosity is sometimes expressed in watts. Stars with bolometric magnitudes of -10 have luminosities of 106L and stars with bolometric magnitude of +17 have luminosities of 10-5L. The Hertzsprung-Russell diagram relates luminosity with absolute magnitude, stellar classification, and surface temperature.

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61 Cygni A | 61 Cygni B | Achernar | Alpha Centauri A | Alpha Centauri B | Becrux | Beta Centauri | Betelgeuse | Epsilon Indi | GJ 1061 | Hadar | Kapteyn's Star | Kruger 60 A | Kruger 60 B | Lacaille 9352 | Lalande 21185 | List of astronomical topics | List of astronomical topics (N-Z) | List of physics topics F-L | Pollux (star) | Procyon A | Procyon B | Ras Algethi | Regulus | Ross 128 | Ross 154 | Ross 248 | Sirius A | Sirius B | Spica | Tau Ceti | Wolf 359

 

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Luminosity".

 

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