The coolest stars are red.
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The color of the coolest star is red. Cool stars emit lower-energy, longer-wavelength light, which results in a reddish appearance.
Red stars are the coolest of the stars.However, for completeness:A brown dwarf is cooler.A white dwarf can be the hottest and one of the coolest (Depending on age)A black dwarf is the coldest.
The hottest stars are blue in color and have surface temperatures exceeding 30,000 K. Following the sequence: O, B, A, F, G, K, M (from hottest to coolest), O-type stars are the hottest, with temperatures reaching over 30,000 K, while M-type stars are the coolest with temperatures around 2,400 K.
The coolest stars in the sky, like Betelgeuse and Antares, appear reddish in color due to their relatively low surface temperatures compared to other stars. This color is a result of their cooler surface emitting more red and infrared light.
The spectral class letters in astronomy represent the temperature and color of stars. The sequence starts with O (hottest and bluest stars) and ends with M (coolest and reddest stars). The spectral class letters are O, B, A, F, G, K, and M.