* Spectral Classification: The "F" in F0 and F2 refers to the star's spectral class, which is determined by its surface temperature. F stars are generally yellow-white in color and have a surface temperature ranging from about 7,500 to 5,900 Kelvin.

* Numbering System: The numbers within a spectral class (like 0, 2, 5, etc.) indicate finer temperature differences. A smaller number indicates a hotter star.

* Brightness & Temperature: Hotter stars are more luminous (brighter). This is because they emit more energy per unit of surface area due to their higher internal temperatures.

Therefore, an F0 star, being hotter than an F2 star, will be intrinsically brighter.