Rigel and Deneb are not found in globular clusters. They are both bright stars, but they are young, massive stars that live outside of globular clusters.

Here's why:

* Globular clusters are ancient, densely packed collections of stars. They contain primarily old, low-mass stars.

* Rigel and Deneb are blue supergiants, meaning they are very massive and have very short lifespans. These types of stars wouldn't survive long enough to be found in a globular cluster.

Instead of Rigel and Deneb, globular clusters are typically characterized by:

* Red giants: These are old, evolved stars that have exhausted their core hydrogen fuel and have expanded significantly.

* Horizontal branch stars: These stars are fusing helium in their cores and are often found in a characteristic "horizontal branch" on a Hertzsprung-Russell diagram.

So, while Rigel and Deneb are very bright stars, they are not found in aging globular clusters.