vice.sources

The VICE dataframe: nucleosynthetic sources

Stores the dominant astrophysical enrichment channels of each element. These values are adopted from Johnson (2019) 1. Stored values are of type list, elements of which are of type str.

• “BBN”: Big Bang Nucleosynthesis

  A statistically significant portion of this element’s present-day abundances was present prior to the onset of star formation in the universe.

• “CCSNE”: Core Collapse Supernovae

  A statistically significant portion of this element’s present-day abundances is due to massive star explosions.

• “SNEIA”: Type Ia Supernovae

  A statistically significant portion of this element’s present-day abundances is due to white dwarf explosions.

• “AGB”: Asymptotic Giant Branch Stars

  A statistically significant portion of this element’s present-day abundances is due to synthesis in AGB stars.

• “NSNS”: Neutron Star Mergers, R-process Nucleosynthesis

  A statistically significant portion of this element’s present-day abundances is due to neutron star mergers, or other astrophysical sites of r-process nucleosynthesis.

Indexing

• str [case-insensitive]

  The symbol of a chemical element as it appears on the periodic table.

Item Assignment

This instance of the VICE dataframe does not support item assignment.

Functions

• keys

• todict

Example Code

>>> import vice
>>> vice.sources['o']
["CCSNE"]
>>> vice.sources['he']
["BBN", "CCSNE", "AGB"]
>>> vice.sources['fe']
["CCSNE", "SNEIA"]

1

Johnson (2019), Science, 363, 474