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In this paper we discuss the photometric and spectroscopic observations ofnewly discovered (symbiotic) systems in the dwarf spheroidal galaxy NGC 205.The Gemini Multi-Object Spectrograph on-off band [O III] 5007 A emissionimaging highlighted several [O III] line emitters, for which optical spectrawere then obtained (Gon\c{c}alves et al. 2014). The detailed study of thespectra of three objects allow us to identify them as true, likely and possiblesymbiotic systems (SySts), the first ones discovered in this galaxy. SySt-1 isunambiguously classified as a symbiotic star, because of the presence of uniqueemission lines which belong only to symbiotic spectra, the well known O VIRaman scattered lines. SySt-2 is only possibly a SySt because the Ne VII Ramanscattered line at 4881 A, recently identified in a well studied Galacticsymbiotic as another very conspicuous property of symbiotic, could as well beidentified as N III or [Fe III]. Finally, SySt-3 is likely a symbiotic binarybecause in the red part of the spectrum it shows the continuum of a late giant,and forbidden lines of moderate- to high-ionization, like [Fe v] 4180 A. Themain source for skepticism on the symbiotic nature of the latter systems istheir location in the PN region in the [O III] 4363/H\gamma\ vs [O III]5007/H\beta\ diagnostic diagram (Gutierrez-Moreno et al. 1995). It is worthmentioning that at least another two confirmed symbiotics, one of the LocalGroup dwarf spheroidal IC 10 and the other of the Galaxy, are also misplaced inthis diagram.

Discovery of true, likely and possible symbiotic stars in the dwarf spheroidal NGC 205