Stellar models are available for five different initial helium abundance Y and 19 different metallicity Z for each Y.
This grid of models is computed with initial helium abundance Y and metallicity Z linked by the linear relation:
where Yp=0.2485 is the primordial helium abundance (i.e. the result of the Big Bang nucleosynthesis) and Δ Y/Δ Z the ratio which provides the stellar nucleosynthesis enrichment.
Z = 0.0001 Y = 0.249 |
tracks and isochrones |
Z = 0.0002 Y = 0.249 |
tracks and isochrones |
Z = 0.0003 Y = 0.249 |
tracks and isochrones |
Z = 0.0004 Y = 0.249 |
tracks and isochrones |
Z = 0.0005 Y = 0.25 |
tracks and isochrones |
Z = 0.0006 Y = 0.25 |
tracks and isochrones |
Z = 0.0007 Y = 0.25 |
tracks and isochrones |
Z = 0.0008 Y = 0.25 |
tracks and isochrones |
Z = 0.0009 Y = 0.25 |
tracks and isochrones |
Z = 0.001 Y = 0.25 |
tracks and isochrones |
Z = 0.002 Y = 0.252 |
tracks and isochrones |
Z = 0.003 Y = 0.254 |
tracks and isochrones |
Z = 0.004 Y = 0.256 |
tracks and isochrones |
Z = 0.005 Y = 0.258 |
tracks and isochrones |
Z = 0.006 Y = 0.26 |
tracks and isochrones |
Z = 0.007 Y = 0.262 |
tracks and isochrones |
Z = 0.008 Y = 0.264 |
tracks and isochrones |
Z = 0.009 Y = 0.266 |
tracks and isochrones |
Z = 0.01 Y = 0.268 |
tracks and isochrones |