luminosity

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Related to luminosities: Luminosity function

luminosity

the amount of light emitted or reflected - brightness.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

brightness

Attribute of visual sensation according to which an area appears to emit more or less light. Syn. luminosity. Note 1: In British recommended practice, the term brightness is now reserved to describe brightness of colour (i.e. the opposite of dullness) as used in the dyeing industry. Note 2: This attribute is the psychosensorial correlate, or nearly so, of the photometric quantity luminance (CIE).
Brightness Acuity Tester (BAT) See glare tester.
brightness constancy See brightness constancy.
brightness enhancement See Brücke-Bartley effect.

References in periodicals archive ?

The combination of the XLF and absorption functions enables us to construct a so-called "population synthesis model" of the XRB, (53,71,75-77) where the contributions to the XRB spectrum from AGNs with different luminosities, redshifts, and absorptions are quantitatively described.

Cosmological evolution of supermassive black holes in galactic centers unveiled by hard X-ray observations

In studying the absolute magnitude of various stars, Hertzsprung could calculate their relative luminosities. In 1905 he noticed that there were two kinds of red stars: red stars with very high luminosity (which we now call red giants) and red stars with very low luminosity (which we now call red dwarfs).

Color and stellar luminosity

Star colors and luminosities can be extracted from SExtractor.

Sequencing the stars: using images of star clusters acquired with CCD cameras, amateurs can create their own Hertzsprung-Russell diagrams

Like light bulbs of different wattages, the bursts come in a wide range of luminosities, Kulkarni notes.

Scoping out the homes of gamma-ray bursts

Because Type Ia supernovae generally have similar luminosities, astronomers have used them as "standard candles" to measure the universe's expansion history.