How many stars have companions?

How many stars have companions?

The fraction of binary stars has implications in many fields of astronomy. Yet, we still don’t know this number, and even less how it varies with properties such as metallicity. Today’s paper sheds some light on this open question.
Image credits: Palomar Observatory/STScI/WikiSky

New twinkles in the sky

New twinkles in the sky

Pulsations are the way for astronomers to probe the interior of stars. Today’s paper announces the discovery of a new class of pulsator stars. What makes them different? And what exciting new things can we learn from that?
Image credits: Paweł Pietrukowicz