vice.singlezone.Z_solar

Type : real number

Default : 0.014

The metallicity by mass of the sun \(M_Z/M_\odot\). This is used in calibrating the total metallicity of the ISM, which is necessary when there are only a few elements tracked by the simulation with metallicity dependent yields. This scaling is implemented as follows:

\[Z_\text{ISM} = Z_\odot \left[\sum_i Z_i\right] \left[\sum_i Z_i^\odot\right]^{-1}\]

where the summation is taken over the elements tracked by the simulation.

Note

The default value is the metallicity calculated by Asplund et al. (2009) 1. VICE adopts the Asplund et al. (2009) measurements on their element-by-element basis in calculating [X/H] and [X/Y] in simulations; it is thus recommended that users adopt these measurements as well so that the adopted solar composition is self-consistent. This however has no qualitative impact on the behavior of the simulation.

Example Code

>>> import vice
>>> sz = vice.singlezone(name = "example")
>>> sz.Z_solar = 0.014

1

Asplund et al. (2009), ARA&A, 47, 481