The seven-year photobomb: Distant star’s dimming was likely a ‘dusty’ companion getting in the way, astronomers say

Astronomers discovered that the star Gaia17bpp gradually brightened over a 2 1/2-year period. But follow-up analyses revealed that the star itself wasn’t changing. Instead, it’s likely part of a rare type of binary system. Its apparent brightening was the end of a years-long eclipse by an unusual, “dusty” stellar companion.

Astronomers document the rise and fall of a rarely observed stellar dance

Astronomers have catalogued 126 years of changes to HS Hydra, a rare evolving eclipsing binary. The two stars in HS Hydra began to eclipse each other starting around a century ago, peaking in the 1960s. The degree of eclipsing then plummeted over the course of just a half century, and will cease around Feb. 2021.