Which star is described as a red supergiant?

Antares is classified as a red supergiant star, which is a type of massive star that has exhausted the hydrogen fuel in its core and has entered a later stage of stellar evolution. Red supergiants are characterized by their large size and cool temperatures, resulting in a reddish hue. Antares, located in the constellation Scorpius, exemplifies these characteristics with a spectral type of M1.5Iab, indicating its status as a luminous example of a red supergiant.

In contrast, other stars listed do not fit this classification. Rigel, for instance, is a blue supergiant, exhibiting a much hotter temperature and a blue color due to its high mass and energy output. Aldebaran, while also a red star, is classified as a red giant rather than a supergiant, indicating it is smaller and less massive than red supergiants. Polaris, known as the North Star, is a yellow supergiant, further distinguishing it from red supergiants based on its color and temperature.