- K-type main-sequence star
A K-type main-sequence star (K V), also referred to orange dwarf, are main-sequence (hydrogen-burning) stars of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars of luminosity class V and yellow G-type main-sequence stars of luminosity class V. They have masses of from 0.5 to 0.8 times the mass of the Sun[dubious ] and surface temperatures between 3,900 and 5,200 K., Tables VII, VIII. Examples include Alpha Centauri B and Epsilon Indi.
These stars are of particular interest in the search for extraterrestrial life because they are stable on the main sequence for a very long time (15 to 30 billion years, compared to 10 billion for the Sun). This may create an opportunity for life to evolve on terrestrial planets orbiting such stars. Orange dwarfs are about three to four times as abundant as sun-like stars, making planet searches easier.
Formation · Pre–main sequence · Main sequence · Horizontal branch · Asymptotic giant branch · Dredge-up · Instability strip · Red clump · PG1159 star · Mira variable · Planetary nebula · Protoplanetary nebula · Luminous red nova · Luminous blue variable · Wolf–Rayet star · Supernova impostor · Supernova · Hypernova · Hertzsprung–Russell diagram · Color–color diagram
Protostars Luminosity class Spectral classification Remnants Failed and
Nucleosynthesis Structure Properties Star systems Earth-centric
Star names · Arabic names · Chinese names · Most massive · Least massive · Largest · Brightest (Historical) · Most luminous · Nearest (Nearest bright) · Stars with exoplanets · Brown dwarfs · Planetary nebulae · Novae · Notable supernovae · Supernova remnants · Supernova candidates · Timeline of stellar astronomy
Related articles Star portal
Wikimedia Foundation. 2010.