Geballe, T. R; Kameswara Rao, N; Clayton, G. C
(Institute of Physics, 2009-06)
We present high resolution spectra of the five known hydrogen-deficient carbon (HdC) stars in the vicinity of the 10830 Å line of neutral helium. In R Coronae Borealis (RCB) stars the He I line is known to be strong and ...