luminosity
luminosity (symbol
L) The amount of radiation a star emits, corrected for
interstellar absorption. It is expressed in watts, or in terms of the luminosity of the Sun (symbol L⨀), approximately 3.9 × 10
26 watts. Luminosity is related to the absolute bolometric magnitude (see
absolute magnitude) of the star, M
bol, by the equation
Mbol −4.72 = −2.5 log (L/L⨀)The luminosities of stars range from over 10
5L⨀ for the brightest supergiants to less than 10
−5 \ L⨀ for feeble red dwarfs. For X-ray sources it is usual to define luminosity not bolometrically but in particular passbands.
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Quantization state of baryonic mass in clusters of galaxies.(quantum celestial mechanics )
Magazine article from: Progress in Physics; 1/1/2007; ; 700+ words
; ...explaining the rotation and luminosity curves of individual...system's total baryonic mass and its total angular...baryonic Tully-Fisher relation for individual galaxies...predictions for the baryonic mass for ten galaxy clusters to the detected baryonic masses. Our new result is that the ...
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Research from G.W. Pratt and colleagues has provided new data on astrophysics.
Newspaper article from: Physics Week; 6/16/2009; 700+ words
; ...the X-ray luminosity-Y-X relation...the high luminosity side, the...the scaling relations by more than...as a total mass proxy, we...corrected local luminosity-mass relation and compare...luminosity scaling relations from a representative...
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Research on astronomy and astrophysics discussed by scientists at Nanjing Normal University.
Newspaper article from: Physics Week; 12/23/2008; 700+ words
; ...the M-BH-sigma* relation for radio-loud quasars...supermassive black hole mass (M-BH) is calculated...relation and the luminosity bias. (3) The radio luminosity is proportional to...dependence of the radio luminosity on the mass and the...account for their radio ...
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Studies from University of Crete add new findings in the area of astrophysics.
Newspaper article from: Physics Week; 9/23/2008; 700+ words
; ...the ''variability luminosity'' relation as a function of redshift...variability - redshift'' relation in two luminosity bins...we compare with the relations that we observe. When...variability - luminosity'' relation that has a larger amplitude...Their black hole mass ...
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University of Perugia details research in astrophysics.
Newspaper article from: Physics Week; 10/14/2008; 700+ words
; ...and intermediate- mass stars. Our understanding...knowledge of their luminosities and mass loss rates...quantitative determination of luminosities (and subsequently...diagrams, and compare luminosities and colors of S...rich AGB stars. Luminosity estimates are also...period- ...
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Research from I. Saviane et al has provided new information about astrophysics.
Newspaper article from: Physics Week; 9/23/2008; 614 words
; "The luminosity-metallicity relation is one of the...none of the relations available today...infrared (NIR) luminosities for a sample...use of NIR luminosities is intended...better proxy to mass than the blue luminosities commonly used...well-defined luminosity-metallicity ...
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Studies from J.Y. Liu et al provide new data on science.
Newspaper article from: Physics Week; 11/3/2009; 633 words
; ...ray to bolometric luminosity depends on the Eddington ratio and black hole mass. Our sample comprises...independent of the black hole mass for radio-quiet AGNs. The relation of log(L2-10kev...with respect to the mass of the black hole can...
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Investigators at University of California target astronomy.
Newspaper article from: Journal of Physics Research; 4/28/2009; 700+ words
; ...observed m(BH) - sigma relation and quasar luminosity functions. This provides...statistically infer host halo masses for quasar observations using luminosity and redshift alone...distribution of halo masses that quasars occupy as...
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New astrophysics research has been reported by Y.A. Fadeyev et al.
Newspaper article from: Physics Week; 3/10/2009; 700+ words
; ...stars with initial masses 70M(circle dot...assumptions about the mass loss rate and were...coefficients of the mass-luminosity relation for Wolf-Rayet stars. Several more accurate mass-luminosity relations for mass loss rates...the mass-luminosity ...
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New science research from University of Durham described.
Newspaper article from: Journal of Physics Research; 9/1/2009; 700+ words
; ...model for the luminosities, morphologies...galform models the luminosity and size of the...heavy initial mass function (IMF...morphology-luminosity relation and the colour...to the size-luminosity relation. The...predicts the size-luminosity relation for ...
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mass-luminosity relation
Book article from: The Columbia Encyclopedia, Sixth Edition
mass-luminosity relation in astronomy, law stating...to some power of the mass of the star. More massive...the 3.5 power of the mass. This means that if the mass is doubled, the luminosity...independently measuring the masses of many visual binary...
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mass–luminosity relation
Book article from: A Dictionary of Astronomy
mass–luminosity relation The relationship between...main sequence and its mass. Factors involved include...less than 0.4 solar masses, which are fully convective...varies as the square of the mass. For stars of mass similar...
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luminosity
Book article from: The Columbia Encyclopedia, Sixth Edition
...33 ergs per sec. The luminosities of other stars are commonly...in terms of the sun's luminosity. The known luminosities of stable stars range...star. See magnitude ; mass-luminosity relation ; stellar evolution .
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Hertzsprung–Russell diagram
Book article from: A Dictionary of Astronomy
...diagram shows how the luminosities and surface temperatures...astronomers can estimate its mass and the stage of its...supergiants , with luminosities 300 to 100 ...dying stars with luminosities typically 10 ...colour–luminosity relation ; colour–...
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Parenago, Pavel Petrovich
Dictionary entry from: Complete Dictionary of Scientific Biography
...Parenago concern the Hertzsprung-Russell diagram (the “ spectrum luminosity ” relation and the “ mass-radius-luminosity ” relation). Parenago also studied the kinematics of stars and stellar dynamics...
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