Detailed abundance analysis of globular clusters in the Local Group: NGC
  147, NGC 6822, and Messier 33
  We present new abundance measurements for eleven GCs in the Local Group
galaxies NGC 147, NGC 6822, and Messier 33. These are combined with previously
published observations of four GCs in the Fornax and WLM galaxies. The
abundances were determined from analysis of integrated-light spectra, obtained
with HIRES on the Keck I telescope and with UVES on the VLT. We find that the
clusters with [Fe/H]<-1.5 are all alpha-enhanced at about the same level as
Milky Way GCs. Their Na abundances are also generally enhanced relative to
Milky Way halo stars, suggesting that these extragalactic GCs resemble their
Milky Way counterparts in containing significant fractions of Na-rich stars.
For [Fe/H]>-1.5, the GCs in M33 are also alpha-enhanced, while the GCs that
belong to dwarfs (NGC 6822 SC7 and Fornax 4) have closer to Solar-scaled
alpha-element abundances, thus mimicking the abundance trends observed in field
stars in nearby dwarf galaxies. The abundance patterns in SC7 are remarkably
similar to those in the Galactic GC Ruprecht 106, including significantly
sub-solar [Na/Fe] and [Ni/Fe] ratios. In NGC 147, the GCs with [Fe/H]<-2.0
account for about 6% of the total luminosity of stars in the same metallicity
range, a lower fraction than those previously found in the Fornax and WLM
galaxies, but substantially higher than in the Milky Way halo.
