A D'-type symbiotic binary in the planetary nebula SMP LMC 88
Udalski, Andrzej; Kozłowski, Szymon; Miszalski, Brent; Iłkiewicz, Krystian; Mikołajewska, Joanna
Poland, South Africa
Abstract
SMP LMC 88 is one of the planetary nebulae (PNe) in the Large Magellanic Cloud. We identify in its spectrum Raman scattered O VI lines at 6825 and 7083 Å. This unambiguously classifies the central object of the nebula as a symbiotic star (SySt). We identified the cold component to be a K-type giant, making this the first D'-type (yellow) SySt discovered outside the Galaxy. The photometric variability in SMP LMC 88 resembles the orbital variability of Galactic D'-type SySt with its low amplitude and sinusoidal light-curve shape. The SySt classification is also supported by the He I diagnostic diagram.