K star

'K star' can also refer to...

K star

The star formation history of K-selected galaxies

Current star formation in early-type galaxies and the K+A phenomenon

On the kHz QPO frequency correlations in bright neutron star X-ray binaries

Annual Parallax of the K-Type Star System IRAS 22480+6002 Measured with VERA

Qatar-1b: a hot Jupiter orbiting a metal-rich K dwarf star

A rival for Babcock's star: the extreme 30-kG variable magnetic field in the Ap star HD 75049*

A PSF-based approach to Kepler/K2 data – I. Variability within the K2 Campaign 0 star clusters M 35 and NGC 2158

Kepler's first view of O-star variability: K2 data of five O stars in Campaign 0 as a proof of concept for O-star asteroseismology

Ultra-high-resolution observations of circumstellar K i and C2 around the post-AGB star HD 56126

Implications of kHz quasi-periodic brightness oscillations in X-ray binaries for neutron star structure

WASP-10b: a 3M J , gas-giant planet transiting a late-type K star

Pathways to massive black holes and compact star clusters in pre-galactic dark matter haloes with virial temperatures ≳10 000 K

A Search for Molecular Gas toward a BzK-Selected Star-Forming Galaxy at z = 2.044

The star formation history and accretion-disc fraction among the K-type members of the Scorpius–Centaurus OB association

HD 24355 observed by the Kepler K2 mission: a rapidly oscillating Ap star pulsating in a distorted quadrupole mode

The spectral energy distributions of K+A galaxies from the UV to the mid-IR: stellar populations, star formation and hot dust

The K-band luminosity functions of super star clusters in luminous infrared galaxies, their slopes and the effects of blending

The M4.5V flare star AF Psc as seen in K2 engineering data


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A star of spectral type K, somewhat cooler than the Sun and appearing orange in colour. K-type stars on the main sequence have surface temperatures in the range 3900–5200 K, while giants are about 100–400 K cooler, and supergiants a few hundred degrees cooler still. Masses of main-sequence K stars are 0.5–0.8 solar masses, and their luminosities 0.1–0.4 times the Sun's. Giants are of 1.1–1.2 solar masses and have luminosities 60–300 times the Sun's, while K supergiants can be up to 13 solar masses and have luminosities as much as 40 000 times the Sun's. The dominant spectral features of K-type stars are the neutral metal lines of iron and titanium, with calcium (both Ca I and Ca II) being particularly strong. The molecular bands due to cyanogen (CN) and titanium oxide (TiO) strengthen considerably from K0 to K9. The best-known stars of this type are Arcturus, a K1 giant, and Aldebaran, a K5 giant.

Subjects: Astronomy and Astrophysics.

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