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white ˈdwarf SUBST ASTRON

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Novae are thought to occur on the surface of a white dwarf in a binary system. en.wikipedia.org

However, more detailed spectroscopic observations in 2005 appear to show that it is not a white dwarf, but a high-velocity halo metal-poor subdwarf. en.wikipedia.org

As the star is cooling to form a white dwarf, helium ignites in a shell around the core, causing the outer laters to expand rapidly. en.wikipedia.org

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