Dwarf Stars

Lauren P.

What are they?

Dwarf stars have relatively low mass and low to average luminosity, meaning they don't give off very much light. Most are main-sequence stars, those particular stars are in the main-sequence of the Hertzsprung-Russel diagram (shown below).

Hertzsprung-Russel Diagram

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Types of Dwarf Stars

There are 5 different types of dwarfs stars: white, red, black, brown, and yellow. White dwarfs are the remains of a red giant star. Red dwarfs have less brightness and mass than white dwarfs. Black dwarfs are even less bright and massive than red dwarfs and give off no detectable radiation. Brown dwarfs are formed when insufficient mass allows for nuclear fusion to take place. Yellow dwarfs have mass comparable to the sun's.

Below is the most common type, a white dwarf star.

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Lifecycle

Dwarf stars are formed from proto-stars (a cloud of gas and dust that gradually collapses, forms and hot, dense core, then evolves into a star) to begin the process of nuclear fusion (when two nuclei combine to form one nucleus, with the release of energy).
Evolution of Stars in Dwarf Galaxy Leo IV | Hubble Space Telescope NASA ESA HST HD Video

Sources

"Dwarf Star." The Free Dictionary. Farlex, n.d. Web. 04 Nov. 2014.


"Stars - NASA Science." Stars - NASA Science. N.p., n.d. Web. 02 Nov. 2014.


"Stars." Science Year: The World Book Annual Science Supplement, 2013. Chicago, IL: World Book, 2013. N. pag. Print.


Http://sci.esa.int/science-e-media/img/be/hr_diagram.jpg


Http://www.astrobio.net/images/galleryimages_images/Gallery_Image_10227.jpg


https://www.youtube.com/watch?v=-C4trW7hGG4