Astrophysics (Index)About

red dwarf

(small, cool main-sequence star)

A red dwarf is a small main sequence star, generally an M-type star (M dwarf). Sometimes the term is used to include K-type stars (K dwarfs), but those can be referred to as orange dwarfs. The mass range is from 0.075 to about 0.5 solar mass. The surface temperature is 2000-4000 K. Red dwarfs make up about 75% of the stars in the Milky Way, and many of the nearest stars are red dwarfs. They have become of interest in the search for habitable extra-solar planets because there are so many (thus, as a group, they host many planets), so many are close (allowing planet study), and their relative dimness is conducive to direct imaging of the planets. Red dwarf examples:

(star type)
Further reading:

Referenced by pages:
AD Leonis (AD Leo)
Alpha Centauri (α Centauri)
Barnard's Star
California-Kepler Survey (CKS)
convection zone
Deep Multicolor Survey (DMS)
giant star
Gliese-Jahreiss Catalog (GJ)
Gliese 436 b (GJ 436 b)
Hayashi track
HD 114762
HD 189733 b
Henyey track
Kapteyn's Star
Lacaille 9352
Lalande 21185
L-type star (L)
LHS 1140
LHS 3844 b
low mass star (LMS)
main sequence star (MS)
M-type star (M)
M dwarf
MEarth Project (MEarth)
post-main-sequence star
proton-proton chain
Proxima b
rare designator prefixes
red-giant branch (RGB)
Ross 154
Ross 248
Scholz's Star
stellar core
stellar designation
stellar structure
Teegarden's Star
TOI 700 d
variable star
Wolf 359