Red stars (Red dwarfs and red giants) have a spectral class of M.
Red giant is a type of star.
red star
Barnard's star is a red dwarf, M-type main sequence star.
Barnard's Star is a red dwarf star
Red stars (Red dwarfs and red giants) have a spectral class of M.
red dwarf star
Aldebaran, Taurus's alpha star, is a red giant.
There are many red dwarf stars in the universe. They are not most common type of star.
Red supergiant
It is a red giant.
Barnard's Star is a very low-mass red dwarf star and has a spectral type of M4V.So it has the colour red.
Teegarden's Star is an M-type red dwarf star located about 12 light years away in the constellation Aries.