Stellar Yields
Joachim Köppen DF3GJ ... Kiel, July 2019
Some brief explanations
- This tool computes amount of chemical elements which are freshly produced
by stars of different masses via fusion processes. The data are based on the
results of stellar evolution and nucleosynthesis calculations. Several models
are given for low mass stars (below 10 Msun - which have a long lifetime,
a complicated evolution including internal mixing) and high mass stars
(above 10 Msun - which have rather short lifetimes, but are major sources
for the synthesis of heavy
elements and end their life in a supernova explosion). Apart from the
'stellar yields' it also computes the 'yield' of an entire generation of stars,
given the initial mass function (IMF) of the stellar population.
- Changing the choices or hitting the Enter key after altering an input field
will display the updated plot and the recomputed yields.
- The Plot shows as a function of the stellar mass the locked-up
mass fraction and the stellar fresh yields for the chosen element, or
the 'population yield' of a stellar generation (integrated over the IMF, AKA 'yield')
as a function of metallicity.
The colour of the curve indicates the metallicity. But note that for elements
which are produced independently of stellar metallicity (AKA 'primary production'),
the curves will be superposed.
- Numerical values of the yields are given in absolute terms (mass fractions) and
also as multiples of the element's solar abundance.
- The mouse position gives the coordinates of that point, allowing to read
numerical values from the plot. In some browsers, these values may not
correspond to the plot. If this happens, keep this page in its initial
top-left corner position.