Stars as Laboratories for Fundamental Physics - MPP Theory Group

84 Chapter 2
Fig. 2.25. Change of the red-giant core mass at helium ignition, M c , as a
function of a factor F ν which multiplies the standard neutrino energy-loss
rate. Triangles: Metallicity Z = 10 −3 (Sweigart and Gross 1978). Squares:
Z = 10 −4 (Raffelt and Weiss 1992).
Fig. 2.26. Variation of the red-giant core mass at helium ignition, M c , as a
function of F ν as in Fig. 2.25 for Z = 10 −4 , Y = 0.22, and M = 0.8 M ⊙ .
Also shown is the mass coordinate M ig where helium ignites (Raffelt and
Weiss 1992).