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Pressure Shifts of Metal Lines in Cool White Dwarfs
Published online by Cambridge University Press: 12 April 2016
Abstract
Model atmosphere techniques and an experimentally confirmed theory of collision broadening of CaII H and K by helium have been combined to shou that the difference in velocity shifts for the two lines is a sensitive diagnostic for the H/He abundance ratio in cool, metallic line uhite dwarfs.
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- Copyright © Springer-Verlag 1989