dwarf star


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.
Related to dwarf star: red dwarf star, neutron star, white dwarf star, Brown dwarf star

dwarf star:

see white dwarfwhite dwarf,
in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation). Typically, a white dwarf star has the mass of the sun and the radius of the earth but does not emit enough light or other radiation to be easily
..... Click the link for more information.
.

dwarf star

(dwarf) Any star lying on the main sequence of the Hertzsprung–Russell diagram. The term arises from the early dual classification of stars into giants (g) and dwarfs (d ): the Sun was classified as d G2. This system has been superseded by that of luminosity classes (see spectral types), and these ‘dwarf’ stars are of luminosity class V. The term main-sequence star is now more common, especially to prevent confusion with white dwarfs; late-type main-sequence stars, however, are still referred to as red dwarfs.

Dwarf Star

 

a star of relatively small size and low luminosity. Most dwarf stars form the lower part of the main sequence of the Hertzsprung-Russell diagram. Their average density ranges from 1 to 60 g/cm3. Evidently, all stars of average and small mass are dwarf stars at a certain stage in their evolution, which is characterized by the start of nuclear reactions and the burning of hydrogen in the star’s nucleus. In addition, dwarfs include stars existing in a state of gravitational contraction for a long time because of their very small mass. Dwarf stars have well-developed convection zones and extended chromospheres; therefore, emission lines are encountered in their spectra. A typical dwarf star is our sun. Among dwarfs there are a considerable number of stars with variable characteristics. A large part of the spherical subsystem of the Milky Way Galaxy and of the planar subsystem excluding the spiral arms consists of dwarf stars. The white dwarfs considerably differ in their structure from ordinary (or red) dwarfs.

V. S. AVEDISOVA

dwarf star

[¦dwȯrf ′stär]
(astronomy)
A star that typically has surface temperature of 5730 K, radius of 428,000 miles (690,000 kilometers), mass of 2 × 1033 grams, and luminosity of 4 × 1033 ergs per second. Also known as main sequence star.
References in periodicals archive ?
When scientists previously estimated the total number of stars, they assumed that all galaxies had the same ratio of dwarf stars as the Milky Way, which is spiral-shaped.
They say the star system will have seen "dramatic changes" recently and the cue ball of the snooker system - the white dwarf star - may have caused violent changes to its own orbit and the orbit of other planets.
The fusion reaction pumping out heat and energy end the life span of a star, hence making it a white dwarf star as it is faint, dense and cold.
A team of astronomers has identified possibly the coldest, faintest white dwarf star ever detected.
The VLT astronomers spotted a faint companion object to the brown dwarf star 2MASSWJ 1207334- 393254 (also known as 2M1207).
The cosmic diamond is a chunk of crystallised carbon in the core of a white dwarf star.
RED DWARF star Robert Llewellyn has revealed the BBC sci-fi comedy is set to boldly go into the great unknown.
TV'S Red Dwarf star Craig Charles has dumped the fiancee who stood by him during his rape trial ordeal to go on a Caribbean holiday with a stunning brunette.
The Red Dwarf star wooed Dubliner Jacqueline Jennings while he was filming TV prison drama The Governor in Ireland.
The white dwarf star V407 Cyg lies 9,000 light-years away in the plane of our Milky Way galaxy.
Eventually the remnant star will collapse to form a white dwarf star.
The dwarf is paired in orbit with yet another dwarf star, the later a lot brighter though.