dwarf star


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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
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.

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 This system has been superseded by that of luminosity classes (see spectral types), and these ‘dwarf’ stars are of luminosity class V. The term main-sequence star is now more common,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 ?
The scientists calculated that elliptical galaxies have more red dwarf stars than predicted.
When red dwarf stars are young, they are known to emit radiation that can be damaging for the atmospheres of the planets that orbit them.
They have investigated 500 white dwarf stars and it's the only one like it they've found.
In this study, we found that a supernova was the result of the interaction between a white dwarf star and a companion star made of helium.
5 can be explained best by two tightly orbiting white dwarf stars spiraling closer and closer until they collided and exploded.
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Red Dwarf star Craig Charles provided the voice for the main character, Wheelie the bin.
It is named for a White Dwarf Star, a small and extremely dense star.
Rodrigo Luger (University of Washington, Seattle) and colleagues have confirmed the existence of the seventh planet around the ultracool dwarf star TRAPPIST-1 (S&T: June 2017, p.
Scientists have known for long now than a Type Ia supernova is primarily a white dwarf star in a binary system collapsing in on itself and then exploding.
Using the Hubble Space Telescope, the astronomers have tested whether the strength of the electromagnetic force is altered in the strong gravitational field of a white dwarf star.