Which spectral class primarily characterizes the K-type Orange Dwarfs in the Morgan–Keenan (MK) classification system?
Answer
K-type stars
The Morgan–Keenan (MK) classification system sorts main-sequence stars primarily based on temperature, using the sequence O, B, A, F, G, K, and M, ordered from hottest to coolest. The Orange Dwarfs are explicitly identified as K-type stars. These stars fall spectrally between the hotter Yellow Dwarfs (like our Sun, G-type) and the much cooler Red Dwarfs (M-type). K-type stars are characterized by having masses between about 0.45 and 0.8 solar masses and surface temperatures generally ranging from 3,900 K to 5,300 K. Their spectra show increasing lines of neutral metals compared to hotter stars, and molecular bands start appearing late in this class.
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