We present results of our study of two planetary nebulae ( PNe ) , PB1 and PC 19 .
We use the optical spectra of these two PNe observed at 2 m Himalayan Chandra Telescope and also archival and literature data for the study .
We use the morphokinematic code SHAPE to construct 3D morphologies of the PNe and the photoionization code CLOUDY to model the observed spectra .
The 3D model of PB 1 consists of an elongated shell surrounded by a bipolar halo and that of PC 19 consists of an open lobed bipolar structure and a spiral filamentary pair .
We analyze the ionization structure of the PNe by deriving several plasma parameters and by photoionization modelling .
We estimate the elemental abundances of the the elements , He , C , N , O , Ne , S , Ar , and Cl , from our analysis .
We find He , C and N abundances to be significantly higher in case of PB 1 .
We estimate different physical parameters of the central stars , namely effective temperature , luminosity and gravity , and of the nebula , namely hydrogen density profiles , radii , etc. , from photoionization modelling .
We estimate distances to the PNe as \sim 4.3 kpc for PB 1 and as \sim 5.6 kpc for PC 19 by fitting the photoionization models to absolute observed fluxes .
Progenitor masses are estimated from theoretical evolutionary trajectories and are found to be \sim 1.67 and \sim 2.38 M _ { \sun } for PB 1 and PC 19 , respectively .