White dwarfs — the exposed cores of dead stars — are the last place astronomers expected to find an oxygen atmosphere. Yet that’s exactly what recently turned up, providing researchers a rare peek ...

White dwarfs that form through the evolution of a single star have atmospheres composed of hydrogen and helium. The core of the white dwarf is typically composed mostly of carbon and oxygen or oxygen ...

Oxygen detector: the Sloane Digital Sky Survey telescope. (Courtesy: Fermilab) The first known white-dwarf star with an oxygen atmosphere has been spotted by astronomers from Brazil and Germany. The ...

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A strange white dwarf star hurtling through the Milky Way may be the survivor of a "partial supernova," a new study finds. White dwarfs are the cool, dim Earth-size cores of dead stars that are left ...