Which spectral type corresponds to L stars?

L stars are classified as very cool and dark red in the spectral classification scheme. They represent a group of cool substellar objects with effective temperatures between approximately 1,300 to 2,000 Kelvin. This is significantly cooler than the earlier spectral types like the M (red dwarfs) or G (yellow stars) types.

The colors associated with L stars can appear deep red to brownish due to their low temperature, which shifts their peak emission into the infrared part of the spectrum rather than visible light. This results in L stars not being very bright compared to hotter stars, and their coloration reflects this coolness.

Understanding the spectral classification helps in identifying the characteristics of various types of stars, including their temperature, luminosity, and composition. An L star's unique color and temperature contribute to its classification as very cool and dark red, distinguishing it clearly from the other types found in the options provided.