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The helium abundance in galactic globular clusters

R. G. Deupree, J. G. Eoll, S. W. Hodson, R. W. Whitaker
1978 Publications of the Astronomical Society of the Pacific  
The problem of the helium abundance in galactic globular clusters is discussed in light of two recent theoretical developments-the inclusion of semiconvection in horizontal-branch models and the explanation of the red edge of the RR Lyrae gap. These two results predict substantially different helium abundances. We propose alterations in redgiant models which can reduce, but by no means remove, the discrepancy.
doi:10.1086/130277 fatcat:z7z7w4glavdwjcdfsqv7sxvxbi