New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulge
Aims: We investigate Galactic bulge planetary nebulae without emission-line central stars for which peculiar infrared spectra have been obtained with the Spitzer Space Telescope, including the simultaneous signs of oxygen and carbon based dust. Three separate sub-groups can be defined characterized by the different chemical composition of the dust
Górny, S. K. et al.
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2010