Capella

Capella and the Helmet of Auriga

The binary-binary star Capella is the bright dot at the top of the image.  If you zoom it, you will see it is quite orange-yellow.  The brighter pair of stars are two yellow giant stars (a bit less orange than the nearby giant Arcturus).   The more massive of the two is slightly more evolved on the cusp of being called an orange giant.  It has probably already begun combining helium to make carbon in its core. The second pair of stars are two red dwarfs about 10,000 AU from the first pair.   The giants are a strong x-ray source about four orders of magnitude brighter than our Sun.

With these two giant stars orbiting so close to each other at about 100 million kilometers, they is a lot of action to look forward to, if we could only wait a few dozen million years as the envelopes of both stars swell to surround the entire binary.   In the meantime, we can watch for the interactions of the strong winds from the two stars that possibly play a role in the x-ray emission from this first stellar x-ray source to be discovered.