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https://doi.org/10.1007/978-94-010-3102-8_16
Copy DOIPublication Date: Jan 1, 1971 |
Helium abundance in stellar atmospheres has been the subject of several recent in-vestigations, essentially induced by progresses in the computation of non-grey model atmospheres (including line blanketing in the far U.V.), by considerable advances in the theory of Stark broadening of helium lines, by non local thermodynamic equilibrium (LTE) work for the helium spectrum and more fundamentally by the intrinsic importance of the helium over hydrogen ratio in cosmological theories.
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