  The literature on precision differential abundances (PDAs) in stars is
extensive. Surveys include sun-like stars in the solar neighborhood, binary
systems, and Galactic clusters. Numerous references as well as a discussion of
relevant mechanisms may be found in papers by Ramirez, et al. (2019) and Nagar,
et al. (2020). A strong impetus for this work is the probability that the
abundances have been influenced by exoplanetary systems and their evolution.
  We calculate the resulting differential abundances ([El/H]) assuming a given
amount of material with the composition of the bulk earth (Wang, et al. 2018)
was added to the stellar convection zone of a dwarf G-type star. The mass of
the convection zone is uncertain and variable, depending on the spectral type.
Here, we assume a mass of $5\cdot 10^{31}$ gm for the stellar convection zone
(SCZ). This is 0.025 $M_\odot$ (Pinsonneault, et al. 2001, Chambers, 2010). For
other SCZ masses, the parameters must be adjusted accordingly. In general, the
sunlike star will not have exactly the solar composition. This contingency is
roughly taken into account in our model. An appendix discusses issues of
volatility and condensation temperature.
