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Pisa Stellar Evolution Data Base for low mass stars

First grid: independent Y and Z

Stellar models are available for five different initial helium abundance Y and 19 different metallicity Z for each Y.

Y
0.25 0.27 0.33 0.38 0.42
Z 0.0001 tracks and
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0.0002 tracks and
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0.0003 tracks and
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0.0004 tracks and
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0.0005 tracks and
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0.0006 tracks and
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0.0007 tracks and
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0.0008 tracks and
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0.0009 tracks and
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0.001 tracks and
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0.002 tracks and
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0.003 tracks and
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0.004 tracks and
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0.005 tracks and
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0.006 tracks and
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0.007 tracks and
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0.008 tracks and
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0.009 tracks and
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0.01 tracks and
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Second grid: Y and Z linked

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
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Z = 0.0002
Y = 0.249
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Z = 0.0003
Y = 0.249
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Z = 0.0004
Y = 0.249
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Z = 0.0005
Y = 0.25
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Z = 0.0006
Y = 0.25
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Z = 0.0007
Y = 0.25
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Z = 0.0008
Y = 0.25
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Z = 0.0009
Y = 0.25
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Z = 0.001
Y = 0.25
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Z = 0.002
Y = 0.252
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Z = 0.003
Y = 0.254
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Z = 0.004
Y = 0.256
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Z = 0.005
Y = 0.258
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Z = 0.006
Y = 0.26
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Z = 0.007
Y = 0.262
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Z = 0.008
Y = 0.264
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Z = 0.009
Y = 0.266
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Z = 0.01
Y = 0.268
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