The star's core collapses as the outer layers swell ... A very similar thing happens here on Earth (albeit on a much smaller scale) when a spinning skater brings in their arms to rotate faster.
The white dwarf, or dead star, in question is the compact companion ... around 1.2 times the mass of the sun and is the fastest-spinning white dwarf ever seen, rotating once every 13 seconds ...
The white dwarf, or dead star, in question is the compact companion of the star HD 49798 ... RX J0648.0–4418 has a mass around 1.2 times the mass of the sun and is the fastest-spinning white dwarf ...
What can fast-spinning stars known as “blue lurkers” teach us about star formation and evolution? This is what a recent study being presented at the 245th American Astronomical Society meeting hopes ...