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W Cephei

W Cephei is a variable star located in the constellation Cepheus, and is a multi-star system. [1]

5 relations: Cepheus (constellation), Constellation, Infrared, Spectral line, Variable star.

Cepheus (constellation)

Cepheus is a constellation in the northern sky.

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Constellation

In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).

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Infrared

Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments).

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Spectral line

A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

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References

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

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