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A star is a sphere composed of hydrogen and plasma. Red dwarfs are the coolest stars , also called M type of  stars. (The solution is Antares, a type M star). These cool stars are small stars in therms of their mass and have not enough mass to produce energy. That is the reason why they are the coolest.

Answer:

Antares, a type M star    

Explanation:

Stars are classified based in temperature using alphabets:

O, B, A, F, G, K, and M

Where, O represents a star having very high temperature. It would also be blue in color. (temperature about 41,000 K)

M represents a cool star having low temperature and red in color. (temperature about 3850 K)

Thus, Antares which is classified as a type M star would be the coolest.

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