Rigel, a blue supergiant star, is primarily composed of hydrogen and helium, just like our Sun. However, it also contains a small percentage of heavier elements, including:

* Carbon

* Nitrogen

* Oxygen

* Iron

The exact composition of Rigel's atmosphere is difficult to determine precisely, but it is believed to be similar to other hot, massive stars.

It's important to note that these elements are not present in their gaseous form within the star's core, but rather as ions (atoms that have lost or gained electrons). These ions are constantly interacting and fusing, releasing immense amounts of energy that make Rigel shine so brightly.