Production
of Helium. The plot shows how the luminosity
of K dwarfs increases as the amount of Helium and heaver elements
increases. The data points represent real K dwarf stars observed
with the Hipparcos satellite. Three computer calculations are
shown by the dark blue, light blue and green lines: they represent
different amounts of Helium produced in stars relative to the amount
of heavier metals. The data indicate that the amount of Helium produced
has been twice the amount of all the heavier than Helium elements
combined (purple line).
