vice.yields.presets.JW20.alt_cc_sr_limitexp¶
The functional form of the alternative CCSN Sr yield explored in Johnson & Weinberg (2020) [1] which is a limited exponential in \(Z\).
Signature: vice.yields.presets.JW20.alt_cc_sr_limitexp(Z, Z_solar = 0.014)
New in version 1.1.0.
Parameters¶
- Zreal number
The metallicity by mass \(M_Z/M_\star\).
- Z_solarreal number [default0.014]
The metallicity by mass of the Sun. Default value is take from Asplund et al. (2009) [2].
Returns¶
- yreal number
The IMF-averaged CCSN Sr yield as a function of metallicity Z.
Notes¶
The yield is defined by:
\[y_\text{Sr}^\text{CC} = 10^{-7}
\left[1 - e^{-10(Z/Z_\odot)}\right]\]
Example Code¶
>>> import vice
>>> from vice.yields.presets import JW20
>>> vice.yields.ccsne.settings['sr'] = JW20.alt_cc_sr_limitexp
>>> modified = lambda z: JW20.alt_cc_sr_limitexp(z, Z_solar = 0.018)
>>> vice.yields.ccsne.settings['sr'] = modified
