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dwarf star

noun, Astronomy
1.
any of the ordinary main sequence stars, as those of spectral types O, B, A, F, G, K, and M.
Also called dwarf.
Compare white dwarf.
Origin
1910-1915
1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dwarf-star

dwarf star

noun
1.
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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dwarf-star in Science
dwarf star  
A relatively small, low-mass star that emits an average or below-average amount of light. Most dwarf stars, including the Sun, are main-sequence stars, the principal exception being white dwarfs, which are the remnants of larger collapsed stars. Main-sequence dwarfs burn their hydrogen at a much slower rate than giant and supergiant stars and are consequently less luminous and have longer lifespans than those non-main-sequence stars do.

Our Living Language  : Despite their diminutive name, most dwarf stars are quite normal main-sequence stars and come in a wide variety of sizes, formed from protostars with sufficient mass to begin the process of nuclear fusion. But there are other stellar and quasistellar objects called dwarf stars as well. Brown dwarfs are formed when insufficient mass accretes for nuclear fusion to take place; brown dwarfs thus never become proper stars. Other kinds of dwarf stars result from the further evolution of main-sequence stars not massive enough to become neutron stars or black holes (which form from the burned-out core of a supernova). The type known as a white dwarf is the remnant of a red giant star that has burned nearly all its fuel. The mutual gravitational attraction of its atoms, no longer counterbalanced by the outward pressure of burning fuel within, causes the star to collapse in on itself. After it contracts and blows its outer layers away as a planetary nebula, the red giant stabilizes as a white dwarf and slowly fades. Our Sun is of a size and mass that will probably cause it to evolve first into a small red giant and eventually into a white dwarf. Red dwarfs have a lower mass and luminosity than white dwarfs, and black dwarfs, if any yet exist, are even less luminous, no longer giving off any detectable radiation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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