LUMINOSITY

in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the square of the radius and the fourth power of the absolute surface temperature. The sun is a medium-sized star with a luminosity of 3.8×1033 ergs per sec. The luminosities of other stars are commonly expressed in terms of the sun's luminosity. The known luminosities of stable stars range from about 1/1,000,000 that of the sun for a relatively cool white dwarf to about 1,000,000 times that of the sun for the hottest known supergiant star. See magnitude; mass-luminosity relation; stellar evolution.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Luminosity
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books on: Luminosity  - 1782 results

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1.
Astronomy & Astrophysics
Book by Morton S. Roberts; American Association for the Advancement of Science, 1985
Subjects: Astronomy, Astrophysics
...which, together with its intrinsic luminosity, yields a useful and informative parameter, the mass-to-luminosity ratio. If galaxies are similar, or...system to be determined given its luminosity. Thus, the "luminous" mass of a cluster...
2.
Creative Color
Book by Faber Birren; Reinhold Pub. Corp., 1961
Subjects: Color In Art, Painting--Technique
...91 21. Luminosity in Mist 95...the effect is visual in that the warm luminosity of yellow is set against the cool and...that transcend and overflow details-- luminosity, luster, iridescence, illusions of...
3.
A Dictionary of Astronomy
Book by Ian Ridpath; Oxford University Press, 1997
Subjects: Astronomy--Dictionaries
...establishing the surface temperature, luminosity, and distance of stars from their spectra...2 mag. or more and somewhat higher luminosity. The Al Velorum stars may be the older...stars of peculiar spectra and unknown luminosity class, magnitudes 4.2 and 5.2, with...
4.
Astronomy and Cosmogony
Book by Sir James H. Jeans; The University Press, 1928
Subjects: Astronomy, Cosmogony, Stars
...as the sun, or, to use the technical phrase, their "luminosity" is 250; Cepheids whose period is 10 days have a luminosity of 1600, while those whose period in 30 days have a luminosity of 10,000. The general relation between period and...
5.
Seeing Black and White
Book by Alan Gilchrist; Oxford University Press, 2006
Subjects: Brightness Perception
...appearance, emphasizing especially the distinction between surface colors and film colors, but he also described volume colors, luminosity, and luster. Surface Colors and Film Colors Surface colors belong to objects. We experience them as opaque and hard...
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journal articles on: Luminosity  - 216 results

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1.
Straightness as a Cue for Luminance Edge Interpretation
Journal article by Alexander D. Logvinenko, Edward H. Adelson, Deborah A. Ross, David Somers; Perception and Psychophysics, Vol. 67, 2005
Subjects: Eyes & eyesight, Light, Luminosity, Psychology, Sensory perception
2.
Inhomogeneous Surrounds, Conflicting Frameworks, and the Double-anchoring Theory of Lightness
Journal article by Paola Bressan; Psychonomic Bulletin & Review, Vol. 13, 2006
Subjects: Experimental psychology, Luminescence, Luminosity, Theory
3.
Nonparametric Methods for Doubly Truncated Data
Journal article by Bradley Efron, Vahe Petrosian; Journal of the American Statistical Association, Vol. 94, 1999
Subjects: Astronomical mathematics, Astronomy--Mathematics, Nonparametric statistics--Methods, Quasars--Research
...the quasars. A positive dependence of luminosity on redshift would mean that earlier...positive dependence between redshift and luminosity, but that appearance is forced on us...sub.i), for the 210 quasars. The log luminosity y is not the same quantity plotted in...
4.
Testing Quasi-Independence of Failure and Truncation Times Via Conditional Kendall's Tau
Journal article by Emily C. Martin, Rebecca A. Betensky; Journal of the American Statistical Association, Vol. 100, 2005
Subjects: Medical research, Medicine, Experimental
...left-truncation time (Tsai 1990), and between a luminosity random variable and a covariate that...rank statistics for testing whether the luminosity and redshift of extragalactic sources...assumed cosmological model. Here source luminosity X is right-truncated by some monotonic...
5.
Tantric Argument: The Transfiguration of Philosophical Discourse in the Pratyabhijñā System of Utpaladeva and Abhinavagupta
Journal article by David Lawrence; Philosophy East & West, Vol. 46, 1996
Subjects: Philosophy, Philosophy, Asian
...the Advaita Vedantin concept of self-luminosity ( svaprakasatva ) to explain how Siva...removing the ignorance of this self-luminosity. 27 The following explanation by...their conceptions of grace and self-luminosity. Abhinava gives these ideas another...
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magazine articles on: Luminosity  - 221 results

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1.
Scar Tissue
Magazine article by Jane Satterfield; The Antioch Review, Vol. 65, Winter 2007
Subjects: Books--Book reviews, Scar Tissue (Book)--Book reviews
...Appalachia opens this, Wrights seventeenth volume of poetry: a familiar gesture, that of valediction, of Augustinian tribute to the luminosity of time, of landscapes fractured fullness: "the country of Narrative, that dark territory / Which spells out our stories in...
2.
Don't Blame the Sun
Magazine article by Graciela Flores; Natural History, Vol. 115, December 2006
Subjects: Astrophysics, Global warming, Physicists, Sun, Sunspots
...with two colleagues, analyzed records of variation in solar luminosity caused by changing dark and bright areas on the Sun-sunspots...began by examining twenty-five recent years of precise solar-luminosity records gathered by radiometers on spacecraft. To peer further...
3.
The Shapley-curtis Debate
Magazine article by Neil de Grasse Tyson; Natural History, Vol. 104, May 1995
Subjects: Astronomy, Curtis, Heber D, Shapley, Harlow (1885-1972), Stars & galaxies
...was he to know that the nearest high-luminosity blue stars bore little resemblance to...this "super" nova must have had the luminosity of nearly a billion suns--a preposterous...variety of nova that indeed reaches the luminosity of a billion suns. What do we call them...
4.
Elisa Sighicelli
Magazine article by David Levi Strauss; Artforum International, Vol. 40, Summer 2002
Subjects: Mixed media painting--Exhibitions, Sighicelli, Elisa--Exhibitions
...from digital manipulation to new economies of scale, Elisa Sighicelli bridges the gap with the oldest tricks in the book: luminosity and immanence. On first viewing the works in the London-based artists US solo debut, one might think they were mounted on...
5.
Dust to Dust
Magazine article by Neil Degrasse Tyson; Natural History, Vol. 112, May 2003
Subjects: Stars & galaxies
...original collapse. With such a feeble luminosity, a brown dwarf is supremely difficult...we can credit to the stars prodigious luminosity. About a hundred times the mass of the...pressure of intense starlight that the luminosity of just a few high-mass stars can heat...
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newspaper articles on: Luminosity  - 148 results

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1.
Beauty Therapy
Newspaper article; The Journal (Newcastle, England), June 3, 2008
Subjects: Skin care products, Skin cleansers (Cosmetics)
Beauty Therapy. CATE BLANCHETT is one of the worlds most beautiful women as much admired for the luminosity of her skin as her acting. Shes advised the SK-11 brand on her beauty regimes to create Cate Blanchetts Essentials Kit for pounds...
2.
Fun Time at Pier Head Will Be Real Switch On!
Newspaper article; Liverpool Echo (Liverpool, England), August 14, 2009
...day Art on the Waterfront festival. A "dress rehearsal" for Luminosity takes place tonight at 9.30 with the full show, which will...will also be more than three hours of music running up to the Luminosity show, and from 4-9pm the Tate will be a hive of activity...
3.
We Love
Newspaper article; Daily Record (Glasgow, Scotland), October 28, 2006
Subjects: Toiletries industry
...MOISTURISER The Definity range claims to penetrate up to 10 layers deep, reducing skin discolouration and age spots, enhancing luminosity, smoothing fine lines and wrinkles and improving skin tone. It is also a great base for make-up. Available from Boots, pounds...
4.
Poets' Corner; Letters
Newspaper article; Coventry Evening Telegraph (England), July 23, 2009
Subjects: Poets
...bracken, red campion raise their vibrant heads toward the sun and its glittering rays paint a cardinal beetle with a splendid luminosity. Pathways amongst the tangled foliage end in a well-used arch that countless black and white snouts have formed, and in the...
5.
Cooking Up a Storm in the Studio
Newspaper article; Western Mail (Cardiff, Wales), August 17, 2007
Subjects: Artists, Painting, Painting (Art)
...answer - egg tempera has a unique and beautiful luminosity. It is applied in semi-transparent layers...If you work very thinly you can get a huge luminosity, and you make that luminosity more extreme by building up other areas." Davies...
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encyclopedia articles on: Luminosity  - 30 results

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1.
Mass-Luminosity Relation
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
MASS-LUMINOSITY RELATION in astronomy, law stating that the luminosity of a star is proportional to some power of the...Hertzsprung-Russell diagram , it is found empirically that the luminosity varies as the 3.5 power of the mass. This means...
2.
Luminosity
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
LUMINOSITY in astronomy, the rate at which energy of all types is radiated by an object in all directions. A stars luminosity depends on its size and its temperature, varying as...surface temperature. The sun is a medium-sized star with a luminosity of 3.8O10 33 ergs per sec. The luminosities of other...
3.
Hertzsprung-Russell Diagram
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...graph (see illustration) showing the luminosity of a star as a function of its surface temperature. The luminosity, or absolute magnitude , increases...that extends from hot stars of high luminosity in the upper left corner to cool stars...
4.
Stellar Evolution
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...cannot continue to produce its present luminosity steadily into the indefinite future...structure , which requires that the luminosity, temperature, and size of a star must...composition, the mass alone determines the luminosity, surface temperature, and size of the...
5.
Spectral Class
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...a classification of the stars by their spectrum and luminosity . In 1885, E. C. Pickering began the first extensive attempt...Roman numeral is added to the spectral class to specify the luminosity, or intrinsic intensity, of a star. A bright supergiant is...
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