Viironen K.; Mampaso A.; Corradi R.L.M.; Drew J.E.; Frew D.J.; Giammanco C.; Greimel R.; Liimets T.; Lindberg J.E.; Rodriguez M.; Sabin L.; Sale S.E.; Wilson P.A.; Zijlstra A.
(2014-04-04)
Aims. A proper determination of the abundance gradient in the Milky Way requires the observation of objects at large galactiocentric distances. With this aim, we are exploring the planetary nebula population towards the ...