A Nitrogen-Enhanced Metal-Poor star discovered in the globular cluster
  ESO280-SC06
  We report the discovery of the only very nitrogen-enhanced metal-poor star
known in a Galactic globular cluster. This star, in the very metal-poor cluster
ESO280-SC06, has [N/Fe]$>+2.5$, while the other stars in the cluster show no
obvious enhancement in nitrogen. Around 80 NEMP stars are known in the field,
and their abundance patterns are believed to reflect mass transfer from a
binary companion in the asymptotic giant branch phase. The dense environment of
globular clusters is detrimental to the long-term survival of binary systems,
resulting in a low observed binary fraction among red giants and the near
absence of NEMP stars. We also identify the first known horizontal branch
members of ESO280-SC06, which allow for a much better constraint on its
distance. We calculate an updated orbit for the cluster based on our revised
distance of $20.6 \pm 0.5~$kpc, and find no significant change to its orbital
properties.
