Paper:	Extreme Helium Stars: A Decade of Progress
Volume:	391, Hydrogen-Deficient Stars
Page:	53
Authors:	Jeffery, C.S.
Abstract:	We review observed properties and theoretical models for extreme helium stars, these being low-mass supergiants of spectral types Ap and Bp in which the Balmer lines are weak or absent, being replaced by neutral helium. We discuss basic properties, surface abundances, pulsation properties, emission-line spectra, evolutionary models, and links with other classes of hydrogen-deficient star. Particular emphasis is given to progress in the last decade. We present some recent observations and outline some of the current challenges presented by these stars.

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