Spectrophotometry and imaging of the two planetary nebulae He 2-436 and Wray 16-423 , recently discovered to be in the Sagittarius dwarf elliptical galaxy , are presented .
Wray 16-423 is a high excitation planetary nebula ( PN ) with a hot central star .
In contrast He 2-436 is a high density nebula with a cooler central star and evidence of local dust , the extinction exceeding that for Wray 16-423 by E _ { B - V } = 0.28 .
The extinction to Wray 16-423 , ( E _ { B - V } =0.14 ) is consistent with the line of sight extinction to the Sagittarius Dwarf .
Both PN show Wolf-Rayet features in their spectra , although the lines are weak in Wray 16-423 .
Images in [ O III ] and H \alpha + [ N II ] , although affected by poor seeing , yield a diameter of 1.2 ^ { \prime \prime } for Wray 16-423 after deconvolution , whilst He 2-436 was unresolved .
He 2-436 has a luminosity about twice that of Wray 16-423 and its size and high density suggest a younger nebula .
In order to reconcile the differing luminosity and nebular properties of the two nebulae with similar age progenitor stars , it is suggested that they are on He burning tracks

An abundance analysis is presented for both PN using empirical abundance determinations .
The abundance pattern is very similar in both nebulae and both show an oxygen depletion of - 0.4 dex with respect to the mean oxygen abundance of Galactic planetary nebulae and [ O/H ] = - 0.6 .
The Sagittarius PN progenitor stars are representative of the higher metallicity tail of the Sagittarius population .
The pattern of abundance depletion is similar to that in the only other planetary nebula in a dwarf galaxy companion of the Milky Way , that in Fornax , for which new spectra are presented .
However the abundances are larger than for Galactic halo PN suggesting a later formation age .
The oxygen abundance of the Sagittarius galaxy deduced from its PN , shows similarities with that of dwarf ellipticals around M 31 , advancing the notion that this galaxy was a dwarf elliptical before its interaction with the Milky Way .