Here's why:

* Stellar Classification: Stars are classified by their temperature and spectral characteristics. Intermediate mass stars fall into the spectral classes F, G, and K.

* Temperature: These stars are cooler than blue giants (like Rigel) but hotter than red dwarfs (like Proxima Centauri). This temperature range corresponds to the yellow and orange parts of the visible spectrum.

* Examples: Our Sun (a G-type star) is a prime example of an intermediate mass star. Other examples include the star Alpha Centauri A (also a G-type star) and the star Pollux (a K-type star).

So, while they're not as blazing hot and blue as the most massive stars, they're certainly not as cool and red as the smallest stars either.