Back نجوم النسق الأساسي من النوع K Arabic Nana naranxa AST Аранжавы карлік Byelorussian Estrella K V Catalan Oranžový trpaslík Czech Оранжă карлик CV Hauptreihenstern der Spektralklasse K German Oranĝkolora nano Esperanto Enana naranja Spanish Nano laranja Basque
| K-type main-sequence star | |
|---|---|
 Sigma (σ) Draconis, or Alsafi, is a K-type main-sequence star | |
| Characteristics | |
| Type | Class of medium-small main sequence star |
| Mass range | 0.6M☉ to 0.9M☉. |
| Temperature | 3900 K to 5300 K |
| Average luminosity | Class V |
| External links | |
 Media category | |
 Q863936 | |
A K-type main-sequence star, also referred to as a K-type dwarf, or orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ("red dwarfs") and yellow/white G-type main-sequence stars. They have masses between 0.6 and 0.9 times the mass of the Sun and surface temperatures between 3,900 and 5,300 K.[1] These stars are of particular interest in the search for extraterrestrial life due to their stability and long lifespan. Many of these stars have not left the main sequence as their low masses mean they stay on the main sequence for up to 70 billion years, a length of time much larger than the time the universe has existed (13.7 billion years).[2] Well-known examples include Toliman (K1 V) and Epsilon Indi (K5 V).[3]
- ^ E. Mamajek (2022-04-16). "A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence". Retrieved 2022-05-14.
- ^ Cite error: The named reference
NASA Mar 2019was invoked but never defined (see the help page). - ^ "Alpha Centauri B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-05.