dwarf star

n. A star, such as the sun, having relatively low mass, small size, and average or below average luminosity.

dwarf star

n (Celestial Objects) any luminosity class V star, such as the sun, lying in the main sequence of the Hertzsprung-Russell diagram. Also called: main-sequence star See also red dwarf, white dwarf

dwarf′ star′

n. a star with relatively small mass and low or average luminosity, as the sun. [1910–15]

dwarf star

A small star of low mass that gives off an average or below average amount of light. The sun is a dwarf star.Did You Know? In the world of stars, even a dwarf is quite large. At 864,000 miles in diameter and more than 330,000 times the mass of Earth, our sun is still a dwarf star. But a dwarf star is indeed small compared with certain other kinds of stars, such as red giants. Dwarf stars come in several varieties. The type of star known as a white dwarf is in fact the remnant of a red giant that has burned nearly all its fuel. Because of the gravitational attraction of its atoms for each other, the star starts to collapse in on itself. After it contracts and blows its outer layers away, the red giant ends up as a white dwarf. A black dwarf is a burned-out white dwarf that no longer gives off detectable radiation. Astronomers also refer to brown dwarfs, which are not stars. A brown dwarf is bigger than Jupiter, the biggest planet in our solar system, but too small to carry on the sustained nuclear reactions that are needed to become a true star.

Translations

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 This system has been superseded by that of luminosity classes (see spectral types), and these ‘dwarf’ stars are of luminosity class V. The term main-sequence star is now more common,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.

单词	dwarf star
释义	dwarf star dwarf star n. A star, such as the sun, having relatively low mass, small size, and average or below average luminosity. dwarf star n (Celestial Objects) any luminosity class V star, such as the sun, lying in the main sequence of the Hertzsprung-Russell diagram. Also called: main-sequence star See also red dwarf, white dwarf dwarf′ star′ n. a star with relatively small mass and low or average luminosity, as the sun. [1910–15] dwarf star A small star of low mass that gives off an average or below average amount of light. The sun is a dwarf star.Did You Know? In the world of stars, even a dwarf is quite large. At 864,000 miles in diameter and more than 330,000 times the mass of Earth, our sun is still a dwarf star. But a dwarf star is indeed small compared with certain other kinds of stars, such as red giants. Dwarf stars come in several varieties. The type of star known as a white dwarf is in fact the remnant of a red giant that has burned nearly all its fuel. Because of the gravitational attraction of its atoms for each other, the star starts to collapse in on itself. After it contracts and blows its outer layers away, the red giant ends up as a white dwarf. A black dwarf is a burned-out white dwarf that no longer gives off detectable radiation. Astronomers also refer to brown dwarfs, which are not stars. A brown dwarf is bigger than Jupiter, the biggest planet in our solar system, but too small to carry on the sustained nuclear reactions that are needed to become a true star. Translations 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. MedicalSeedwarfFinancialSeeDwarf
随便看	ruschuk ruscr ruscus ruscus aculeatus rusd rus (disambiguation) ruse ruse agricultural machinery plant ruse de guerre ruse (disambiguation) ruse district rusees rusell's sign ruse of war ruses rusf rusfd rush rush about or around rush along rush alzheimer's disease center rush (american football) rushan rushan city rush around like a blue-arsed fly