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A U Geminorum-type variable star, or dwarf nova (pl. novae) is a type of cataclysmic variable star consisting of a close binary star system in which one of the components is a white dwarf that accretes matter from its companion. [1]

18 relations: Accretion disc, Apparent magnitude, Binary star, Cataclysmic variable star, Cosmic distance ladder, Gravity, Hubble Space Telescope, Hypernova, Luminosity, Nova, Potential energy, Supernova, Temperature, U Geminorum, V band, Viscosity, White dwarf, WZ Sagittae.

Accretion disc

An accretion disc is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.

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Apparent magnitude

The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

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Binary star

A binary star is a star system consisting of two stars orbiting around their common center of mass.

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Cataclysmic variable star

Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state.

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Cosmic distance ladder

The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.

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Gravity or gravitation is a natural phenomenon by which all things with mass are brought towards (or 'gravitate' towards) one another including stars, planets, galaxies and even light and sub-atomic particles.

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Hubble Space Telescope

The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990, and remains in operation.

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A hypernova (pl. hypernovae or hypernovas) is a type of star explosion with an energy substantially higher than that of standard supernovae.

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In astronomy, luminosity is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time.

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A nova (plural novae or novas) is a cataclysmic nuclear explosion on a white dwarf, which causes a sudden brightening of the star.

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Potential energy

In physics, potential energy is the energy that an object has due to its position in a force field or that a system has due to the configuration of its parts.

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A supernova is a stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun or any ordinary star is expected to emit over its entire life span, before fading from view over several weeks or months.

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A temperature is an objective comparative measure of hot or cold.

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U Geminorum

U Geminorum (U Gem), in the constellation Gemini, is an archetypal example of a dwarf nova.

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V band

The V band ("vee-band") of the electromagnetic spectrum ranges from 40 to 75 GHz.

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The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.

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White dwarf

A white dwarf, also called a degenerate dwarf, is a stellar remnant composed mostly of electron-degenerate matter.

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WZ Sagittae

WZ Sagittae (WZ Sge) is a cataclysmic dwarf nova star system in the Sagitta constellation.

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Redirects here:

Dwarf Nova, Dwarf novae, Dwarf novas, SS Cygni star, SS Cygni variable, SU Ursae Majoris star, SU Ursae Majoris stars, SU Ursae Majoris variable, U Geminorum Star, U Geminorum star, U Geminorum variable, Z Camelopardalis star, Z Camelopardalis variable star, Z Camelopardalis variable stars.


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

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