K-type giant stars

K-type giant stars are large, luminous stars that have expanded and cooled after using up the hydrogen in their cores. They fall into the "orange" spectral class, with a surface temperature between about 3,900 and 5,300°C (7,050 to 9,590°F). These stars are more massive than our Sun and have a bright, orange hue. As giants, they’ve left the main sequence phase of stellar evolution, shining brightly due to nuclear fusion in shells around their cores. K-type giants are important for understanding stellar aging and the evolution of stars similar to, but larger than, the Sun.