The first one of these to be discovered was found in a triple star system.
The first one of these to be discovered was found in a triple star system. Sirius‟s companion, Sirius B, was the  next to be identified. Known to sometimes explode in Type Ia supernovas by carbon detonation, these stars are  believed to be the "corpses" of low mass stars which expand to red giants and undergo the triple-alpha process. The  "black" variation of this star has been proposed but the idea has since been discarded because even one of these  formed at the beginning of the universe would still radiate at temperatures of several thousand Kelvins. FTP, name  this dense class of stars composed of electron-degenerate matter with a comparable mass of the Sun and the volume  of the Earth.
The first one of these to be discovered was found in a triple star system.
white dwarf