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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
    isochrones    		 tracks and
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    0.0002 tracks and
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    0.0003 tracks and
    isochrones    		 tracks and
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    0.0004 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.0005 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones
    0.0006 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.0007 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.0008 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.0009 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.001 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.002 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.003 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.004 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.005 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.006 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones
    0.007 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.008 tracks and
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    isochrones    		 tracks and
    isochrones    		 tracks and
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    0.009 tracks and
    isochrones    		 tracks and
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    isochrones    		 tracks and
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    0.01 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones    		 tracks and
    isochrones

     

    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    		 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