Dwarf star

dwarfDSdwarfs
A dwarf star is a star of relatively small size and low luminosity.wikipedia
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Main sequence

main-sequencemain sequence dwarfmain-sequence star
Most main sequence stars are dwarf stars.
Stars on this band are known as main-sequence stars or dwarf stars.

Stellar classification

spectral typeK-typeG-type
The term was originally coined in 1906 when the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars—classified as K and M in the Harvard scheme could be divided into two distinct groups.
The gravity, and hence the pressure, on the surface of a giant star is much lower than for a dwarf star because the radius of the giant is much greater than a dwarf of similar mass. Therefore, differences in the spectrum can be interpreted as luminosity effects and a luminosity class can be assigned purely from examination of the spectrum.

G-type main-sequence star

yellow dwarfGG-type
Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun.
The revised Yerkes Atlas system (Johnson & Morgan 1953) listed 11 G-type dwarf spectral standard stars; however, not all of these have survived to this day as standards.

Ultra-cool dwarf

ultracool dwarfultracool dwarfsultra-cold dwarf star
Ultra-cool dwarf
An ultra-cool dwarf is a stellar or sub-stellar object of spectral class M that has an effective temperature under 2,700 K. TRAPPIST-1 is a widely known example of an ultra-cool dwarf star.

61 Cygni

61 Cyg61 Cygni A61 Cyg A
61 Cygni is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of about 659 years.

Atom (Ray Palmer)

AtomRay PalmerThe Atom
Schwartz said he had not wanted to reuse the Golden Age Atom, Al Pratt, and had read about dwarf stars and thought a fragment of one could power the new hero's miniaturization.

Kryptonian

alphabetChiptonianKryptonian characters
The light of dwarf stars, pulsars, and quasars also grants Kryptonians different abilities.

Polaris

North Starpole starNorthern Star
The nearest dwarf star is in an orbit of only 18.5 AU (2.8 billion km) from Polaris Aa, about the distance between the Sun and Uranus), which explains why its light is swamped by its close and much brighter companion.

2013 in science

2013
Astronomers report that 6% of all dwarf stars – the most common stars in the known universe – may host Earthlike planets. Additionally, some such exoplanets may exist only 13 light-years from Earth.

Variable star

variablevariable starsvariability
what kind of star is it: what is its temperature, its luminosity class (dwarf star, giant star, supergiant, etc.)?

Debra Fischer

FischerD. FischerFischer, Debra
Fischer has co-authored over 100 papers on dwarf stars and sub-stellar mass objects in the galactic neighborhood, including many on extrasolar planets.

Phi Piscium

φ Pisciumφ Psc
Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star, while others suggest it is a K0 star.

Stephen P. Laurie

S. P. LaurieStephen Laurie
He has also worked on searches for dwarf stars and discovered a supernova (SN 1997bq in NGC 3147) in 1997.

Walter Sydney Adams

Walter AdamsWalter S. AdamsAdams, Walter Sydney
He was able to demonstrate that spectra could be used to determine whether a star was a giant or a dwarf.

HD 38529

HD 38529 A
HD 38529 A is a yellow subgiant star, which has also been classified as a main sequence dwarf of spectral type G4V.

HAT-P-32b

b
Analysis of the data found that HAT-P-32 was a single, moderately rotating dwarf star.

Richard A. Muller

Richard MullerRich Muller
One of his most well known proposals is the Nemesis hypothesis suggesting the Sun could have an as yet undetected companion dwarf star, whose perturbations of the Oort cloud and subsequent effects on the flux of comets entering the inner Solar System could explain an apparent 26 million year periodicity in extinction events.

HAT-P-33b

b
The collected data found that the star was a single dwarf star exhibiting a slight rotation.

WASP-31b

b
WASP-31b is a low-density (puffy) "hot Jupiter" extrasolar planet orbiting the metal-poor dwarf star WASP-31.

WASP-79b

b
WASP-79, or CD-30 1812, is a F-type dwarf star located at 240 parsecs (810 light years) away from Earth.

Warriors' Gate

Doctor WhoDoctor Who and Warriors' Gate
There, she encounters Adric; the two work out that the ship is made from an incredibly dense dwarf star alloy that can contain the Tharils.

Elisabetta Caffau

Elisabetta Caffau is an astronomer who discovered a 13-billion-year-old, low mass, dwarf star named SDSS J102915+172927, or Caffau's Star in 2011.

Harvey Raymond Butcher

Harvey Butcher
Butcher received his PhD from the Australian National University in 1974 for research involving the construction of one of the first high resolution echelle spectrographs in astronomy and its application to elucidating the abundances of R- and S-process chemical elements in dwarf stars of widely differing ages and mean abundance levels.