Nova

Nova. A nova (plural novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently “new” star, that slowly fades over several weeks or many months. Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars. All observed novae involve white dwarfs in close binary systems. The main sub-classes of novae are classical novae, recurrent novae (RNe), and dwarf novae. They are all considered to be cataclysmic variable stars.

Classical nova eruptions are the most common type. They are likely created in a close binary star system consisting of a white dwarf and either a main sequence, subgiant, or red giant star. When the orbital period falls in the range of several days to one day, the white dwarf is close enough to its companion star to start drawing accreted matter onto the surface of the white dwarf, which creates a dense but shallow atmosphere. This atmosphere, mostly consisting of hydrogen, is thermally heated by the hot white dwarf and eventually reaches a critical temperature, causing ignition of rapid runaway fusion.

What is a Nova in astronomy?

A nova (plural novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently “new” star (hence the name “nova”, which is Latin for “new”) that slowly fades over weeks or months. Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars.

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What is a Nova? - Universe Today

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What does it mean when a star goes nova?

The word comes from the latin for “new star,” because often a star previously too dim to be seen with the naked eye can become the brightest object in the sky (besides the sun and the moon) when it becomes a nova. Novae are now known to be caused by a star briefly re-igniting after having lain dormant for many years.

 

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