Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… … Wikipedia
main sequence — noun a) A major grouping of stars that creates a narrow band from the upper left to the lower right when plotted by luminosity and surface temperature on a Hertzsprung Russell diagram. b) The area on the Hertzsprung Russell diagram in which the… … Wiktionary
main-sequence star — /meɪn sikwəns ˈsta/ (say mayn seeksuhns stah) noun Astronomy any of the stars which form the main band in the Hertzsprung Russell diagram, whose energy comes from nuclear fission as they convert hydrogen to helium, the sun being one example …
main sequence — noun Date: 1925 the group of stars that on a graph of spectrum versus luminosity forms a band comprising 90 percent of stellar types and that includes stars representative of the stages a normal star passes through during the majority of its… … New Collegiate Dictionary
main sequence — Astron. a narrow band in the Hertzsprung Russell diagram in which 90 percent of all observed stars are plotted. [1925 30] * * * … Universalium
main-sequence — adjective Of or dealing with a major group of stars forming a band stretching from upper left to lower right on a Hertzsprung Russell diagram when being plotted by luminosity and surface temperature … Wiktionary
main sequence — noun Astronomy a series of types to which most stars other than giants, supergiants, and white dwarfs belong. Origin 1920s: so named because they occupy a broad band on a graph of magnitude against spectral type … English new terms dictionary
main sequence — noun : the broad band of the spectrum luminosity diagram which contains the great majority of stars and the sun and for which the absolute visual magnitudes range from about 3 for stars of spectral type B to 12 for stars of spectral type M … Useful english dictionary
K-type main-sequence star — Hertzsprung–Russell Diagram Spectral Type Br … Wikipedia
Pre-main sequence star — A pre main sequence star (PMS star, or PMS object) is a star in the stage when it has not yet reached the main sequence. It can be a T Tauri star or FU Orionis star (0.5 Solar mass translates into a move along Hayashi tracks (almost vertically… … Wikipedia
