Main sequence
The main sequence of the
Hertzsprung-Russell diagram is the
curve along which the majority of
stars are located. Stars on this band are known as main-sequence stars or dwarf stars. This line is so pronounced because both the
spectral type and the
luminosity depend only on a star's mass (to
zeroth order) as long as it is
fusing hydrogen—and that is what almost all stars spend most of their "active" life doing. These main-sequence (and therefore "normal") stars are called dwarf stars not because they are unusually small. They simply have smaller radii and are less luminous than the other main type of stars, the
giant stars. "
White dwarfs" are a different kind of star which are indeed small.
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Dwarf star
A star, which lies on the main sequence and is too small to be classified as a giant star or a supergiant star. For instance, the Sun is a yellow dwarf star. Main sequence stars of spectral classification K and M are known as
red dwarf stars . Celestial objects, which have formed in the same way as stars, yet have not reached the mass limit required to ignite
nuclear fusion , are known as
brown dwarfs . The cores of dead stars, which are composed of
electron degenerate matter, are known as
white dwarfs.
dwarf star
Eng: dwarf star
Urdu: قصیر سِتارہ ۔ صغیر سِتارہ ۔ ایسے سِتارے جو کم روشن ہوں اور جِن کا حُجم بھی کم ہو ۔
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