Poster abstract details

We report the optical and infrared study of a sample of five new planetary nebulae (PNe) in the IPHAS and DSH catalogue. The PN status of our sample was first confirmed based on optical narrow-band images and low resolution spectra. According to their locations of these objects in the emission-line-ratio diagram, the sources are low excitation PNe but high dynamic ages. They are always fainter than other known ones and easily hidden in the Galactic plane. We found an extended bipolar PN (IPHASX J195248.8+255359) with two faint lobes in H-alpha wavelength and a bright core seen in [OIII]. A spectral energy distribution (SED) with various components of this object is made and the implication on circumstellar dust is discussed. We also find that three IPHAS PNe are located in the GLIMPSE area, all of which have obvious MIR counterparts. In these MIR images, some PNe display prominent emissions in the central
dust torus regions and extend structures. The shapes and relative strength of the IR emission reveal the locations of dust with different temperatures.