H{\alpha} Dots: Direct-Method Metal Abundances of Low-Luminosity
  Star-Forming Systems
  Utilizing low-luminosity star-forming systems discovered in the H$\alpha$
Dots survey, we present spectroscopic observations undertaken using the KPNO 4m
telescope for twenty-six sources. With determinations of robust,
"direct"-method metal abundances, we examine the properties of these dwarf
systems, exploring their utility in characterizing starburst galaxies at low
luminosities and stellar masses. We find that the H$\alpha$ Dots survey
provides an effective new avenue for identifying star-forming galaxies in these
regimes. In addition, we examine abundance characteristics and metallicity
scaling relations with these sources, highlighting a flattening of both the
luminosity-metallicity ($L$-$Z$) and stellar mass-metallicity ($M_{*}$-$Z$)
relation slopes in these regimes as compared with those utilizing samples
covering wider respective dynamic ranges. These local, accessible analogues to
the kinds of star-forming dwarfs common at high redshift will help shed light
on the building blocks which assembled into the massive galaxies common today.
