Fraser Cain on Nostr: Cepheids are variable stars that change brightness in a well-established relationship ...

Cepheids are variable stars that change brightness in a well-established relationship between luminosity and pulsation period. They have been used to measure the Universe's expansion rate with increasing accuracy. A few Cepheids are in binary pairs with a companion star, providing a way to measure their mass. Only one double-Cepheid has ever been found in the Large Magellanic Cloud. In a new study, astronomers report finding nine new binary Cepheids.

https://arxiv.org/abs/2403.12390