Abstract
Extreme helium (EHe) stars are low-mass early-type supergiants with hydrogen-deficient and carbon-rich atmospheres. Progress and recent results in the quantitative analysis of their atmospheres are reviewed, including the first results to include the effects of line-blanketing in the model atmospheres. The hot RCrB star DY Cen has been found to be relatively hydrogen-rich, but extremely metal-poor. A comparison of EHe star abundances with other H-deficient stars is made.
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Simon Jeffery, C. (1992). The atmospheres of extreme helium stars. In: Heber, U., Jeffery, C.S. (eds) The Atmospheres of Early-Type Stars. Lecture Notes in Physics, vol 401. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-55256-1_324
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DOI: https://doi.org/10.1007/3-540-55256-1_324
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