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The UV spectrum of the hot B0V star is significantly below the continuum level due to a large number of absorption lines caused by highly ionized heavy elements. Can you explain why the B0V star, rather than the cooler stars, has all those lines? http://i67.tinypic.com/2u9hn2v.jpg Solution In B0V stars have these emission and absorption lines due to radiative recombination between Hydrogen and Helium ions with electrons and other excitd metal ions present withine the star. Hot and young stars are able to ionize the gas around them which then produces emission spectra. This region is known as H|| region. This occurs only around hot stars as UV photons are required to ionize hydrogen atoms..

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The UV spectrum of the hot B0V star is significantly below the continuum level due to a large number of absorption lines caused by highly ionized heavy elements. Can you explain why the B0V star, rather than the cooler stars, has all those lines? http://i67.tinypic.com/2u9hn2v.jpg Solution In B0V stars have these emission and absorption lines due to radiative recombination between Hydrogen and Helium ions with electrons and other excitd metal ions present withine the star. Hot and young stars are able to ionize the gas around them which then produces emission spectra. This region is known as H|| region. This occurs only around hot stars as UV photons are required to ionize hydrogen atoms.

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  • 1. The UV spectrum of the hot B0V star is significantly below the continuum level due to a large number of absorption lines caused by highly ionized heavy elements. Can you explain why the B0V star, rather than the cooler stars, has all those lines? http://i67.tinypic.com/2u9hn2v.jpg Solution In B0V stars have these emission and absorption lines due to radiative recombination between Hydrogen and Helium ions with electrons and other excitd metal ions present withine the star. Hot and young stars are able to ionize the gas around them which then produces emission spectra. This region is known as H|| region. This occurs only around hot stars as UV photons are required to ionize hydrogen atoms.