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Color index

Index Color index

In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. [1]

31 relations: Alan William James Cousins, Astronomer, Astronomical filter, Astronomy, Black body, Blue, Cambridge University Press, Color, Color–color diagram, Effective temperature, Expression (mathematics), Extinction (astronomy), Harold Johnson (astronomer), Infrared, Kelvin, Logarithm, Magnitude (astronomy), Numerical analysis, Passband, Photometric system, Photomultiplier, Red, Rigel, Star, Stellar classification, Sun, Temperature, UBV photometric system, Ultraviolet, William Wilson Morgan, Yellow.

Alan William James Cousins

Alan William James Cousins (8 August 1903 – 11 May 2001) was a South African astronomer.

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Astronomer

An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside the scope of Earth.

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Astronomical filter

An astronomical filter is a telescope accessory consisting of an optical filter used by amateur astronomers to simply enhance the details of celestial objects (much as with amateur photography).

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Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

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Black body

A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

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Blue

Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model.

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Cambridge University Press

Cambridge University Press (CUP) is the publishing business of the University of Cambridge.

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Color

Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.

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Color–color diagram

In astronomy, color–color diagrams are a means of comparing the apparent magnitudes of stars at different wavelengths.

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Effective temperature

The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.

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Expression (mathematics)

In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context.

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Extinction (astronomy)

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

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Harold Johnson (astronomer)

Harold Lester Johnson (April 17, 1921 – April 2, 1980) was an American astronomer.

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Infrared

Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.

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Kelvin

The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

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Logarithm

In mathematics, the logarithm is the inverse function to exponentiation.

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Magnitude (astronomy)

In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths.

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Numerical analysis

Numerical analysis is the study of algorithms that use numerical approximation (as opposed to general symbolic manipulations) for the problems of mathematical analysis (as distinguished from discrete mathematics).

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Passband

A passband is the range of frequencies or wavelengths that can pass through a filter.

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Photometric system

In astronomy, a photometric system is a set of well-defined passbands (or filters), with a known sensitivity to incident radiation.

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Photomultiplier

Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum.

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Red

Red is the color at the end of the visible spectrum of light, next to orange and opposite violet.

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Rigel

Rigel, also designated Beta Orionis (β Orionis, abbreviated Beta Ori, β Ori), is generally the seventh-brightest star in the night sky and the brightest star in the constellation of Orion—though periodically it is outshone within the constellation by the variable Betelgeuse.

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Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Sun

The Sun is the star at the center of the Solar System.

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Temperature

Temperature is a physical quantity expressing hot and cold.

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UBV photometric system

The UBV photometric system (Ultraviolet, Blue, Visual), also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors.

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Ultraviolet

Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.

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William Wilson Morgan

William Wilson Morgan (January 3, 1906 – June 21, 1994) was an American astronomer and astrophysicist.

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Yellow

Yellow is the color between orange and green on the spectrum of visible light.

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Redirects here:

B-V Colour, B-V color, B-V colour, B-v, B−V color, B−V colour, Color Index, Color indices, Colour Index, Colour index, Colour indices, Intrinsic color index, Normal color index.

References

[1] https://en.wikipedia.org/wiki/Color_index

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