(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
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
Giant stars can also 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)
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Referenced by pages:
AB Pictoris (AB Pic)
barium star (Ba star)
HD 189733 b
red-giant branch (RGB)
Transiting Exoplanet Survey Satellite (TESS)
Tucana Horologium association (THA)
TW Hydrae association (TWA)
TW Hydrae (TW Hya)