4 papers
Chemically inhomogeneous photoionization modelling of the planetary nebula SMC N87
Y. G. Tsamis, D. Pequignot
We present results from dual-abundance photoionization modelling of the planetary nebula SMC N87 (SMC-SMP 27). The models succesfully resolve the observed discrepancy between the h…
A radio-continuum and photoionization-model study of the two planetary nebulae in the Sagittarius dwarf galaxy
G. Dudziak, D. Pequignot, A. A. Zijlstra +1
Radio continuum observations at 1.4, 4.8 and 8.6 GHz of the two Planetary Nebulae (PNe) in the Sagittarius dwarf galaxy reveal the elongated shape of Wray 16-423 and the extreme co…
Third-dredge-up oxygen in planetary nebulae
D. Pequignot, J. R. Walsh, A. A. Zijlstra +1
The planetary nebulae He 2-436 and Wray 16-423 in the Sagittarius dwarf galaxy appear to result from nearly twin stars, except that third-dredge-up carbon is more abundant in He 2-…
Two planetary nebulae in the Sagittarius Dwarf Galaxy
Albert A. Zijlstra, J. R. Walsh
Two planetary nebulae are shown to belong to the Sagittarius Dwarf Galaxy, on the basis of their radial velocities. This is only the second dwarf spheroidal galaxy, after Fornax, f…