What are the characteristics of a k type spectral star?

K-type spectral stars are characterized by their orange hue and surface temperatures ranging from approximately 3,700 to 5,200 Kelvin. They exhibit strong absorption lines of metal elements such as iron and calcium in their spectra, along with molecular bands from titanium oxide (TiO). K-type stars are typically main-sequence stars, often found in the later stages of stellar evolution, and they have a longer lifespan compared to hotter stars, making them important for studying stellar and planetary formation.