Red dwarf
From Memory Alpha, the free Star Trek reference.
A red dwarf is a small, cool, very faint, main sequence star with a surface temperature under about 4,000 K. Red dwarves are the most common type of star.
Proxima Centauri and 40 Eridani C are examples of red dwarf stars.
The homeworld of Makull's species, an M-class planet, also orbited a red dwarf. (VOY: "Time and Again")
