K-type star
(K, K-class star)
(spectral class of star a bit cooler than the Sun)
A K-type star is a star within the K-class,
a spectral class indicating stars with neutral metal
and very weak hydrogen absorption lines,
with an orange color,
and a surface temperature in the 3700-5200 K range.
The spectral energy distribution peaks in the near-infrared/visible range.
Main sequence stars of this class
(sometimes termed orange dwarfs or K dwarfs)
are on the order of 3/4 solar masses, 3/4 solar radius, and 1/5 solar
luminosity.
Such main sequence stars burn their hydrogen in
tens of billions of years.
Characteristics of K-type main sequence stars:
K-type main sequence stars are a good bet for habitable
extra-solar planets, but offer few planets for study because the
stars are much rarer than M-type stars and much dimmer than the
hotter classes.
Giant stars can be of a K-type, including supergiants and
hypergiants.
Example K-type stars include Arcturus (a red giant),
Epsilon Eridani, Epsilon Indi, J1407 (a subgiant),
and TW Hydrae (a pre-main-sequence star).
(star type,spectral class)
Further reading:
http://en.wikipedia.org/wiki/K-type_main-sequence_star
https://en.wikipedia.org/wiki/Stellar_classification#Class_K
WaveL | Freq | Photon Energy | | |
527nm | 569THz | 2.4eV | begin | K-type star |
725nm | 414THz | 1.8eV | end | K-type star |
|
Referenced by pages:
Beta Pictoris b (β Pic b)
calcium (Ca)
FGK star
G band
HD 189733 b
hypergiant
Kepler Telescope
Kepler-16b
M dwarf
Morgan classification
red dwarf
red giant
red-giant branch (RGB)
spectral class
Transiting Exoplanet Survey Satellite (TESS)
Tucana Horologium association (THA)
TW Hydrae association (TWA)
WASP-67b
Wilson-Bappu effect
Index