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Giant Stars

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Giant Stars 

large stars (100-1,000 times larger than the sun) of great luminosities (100-1,000 times the sun’s luminosity) forming a branch of giant stars on the Hertzsprung-Russell diagram; the location of the branch on the diagram differs for Population I and Population II stars of our galaxy (primarily because of the difference in masses). Giant stars have small average densities (10-5—10-7 g/cm3), owing to the extended rarefied envelopes. Evidently they are the ordinary stars of the main sequence at the later stages of evolution (the stage of helium burning). Some giant stars exhibit corpuscular instability (the efflux of matter from the surface).



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Cepheid variables, which are giant stars that pulse in brightness, have long been used as reference points for measuring distances in the nearby universe, according to Jonathan Bird, doctoral student in astronomy at Ohio State.
After a brief history of astronomy and astrophysics, the book is divided into six sections covering the solar system, diffuse nebulas and star birth, star clusters, planetary nebulas, decline & death of giant stars, and galaxies.
Bell of the University of Maryland in College Park and his colleagues used a high-resolution spectrograph to analyze the visible light emanating from the surfaces of a total of 15 red giant stars in the two clusters.
 
 
 
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