Galaxy And Mass Assembly (GAMA): the interplay between galaxy mass, SFR
  and heavy element abundance in paired galaxy sets
  We study the star formation rate (SFR), stellar mass ($M_{\star}$) and the
gas metallicity (Z) for 4,636 galaxy pairs using the Galaxy And Mass Assembly
(GAMA) survey. Our galaxy pairs lie in a redshift range of 0 $<$ $z$ $<$ 0.35,
mass range of 7.5 $<$ log( M$_{\star}$/ M$_\odot$) $<$ 11.5 and $\Delta V$ $<$
1000 km s$^{-1}$. We explore variations in SFR and Z from three point of views:
multiplicity, pair separation and dynamics. We define multiplicity as the
number of galaxies paired with a single galaxy, and analyzed for the first time
variations in SFR and Z for both, single pairs and pairs with higher
multiplicity. For the latter, we find SFR enhancements from 0.025-0.15 dex,
that would shift the M-SFR relation of single pairs by 27$\%$ to higher SFRs.
The effect of Z on the other hand, is of only 4$\%$. We analyze the most and
least massive galaxy of major/minor pairs as a function of the pair separation.
We define major pairs those with mass ratios of 0.5 $<$ $M_1$/$M_2$ $<$ 2,
while pairs with more discrepant mass ratios are classified as minor pairs. We
find SFR enhancements of up to 2 and 4 times with respect to their control
sample, for major and minor pairs. For the case of Z, we find decrements of up
to 0.08 dex for the closest pairs. When we focus on dynamics, Z enhancements
are found for minor pairs with high velocity dispersion $(\sigma_p > 250 \;
\mathrm{km\,s ^{-1}})$ and high multiplicity.
