Abstract Details
| Name: Rahul Bandyopadhyay Affiliation: Satyendra Nath Bose National Centre for Basic Sciences, Kolkata Conference ID: ASI2018_1213 Title : Photoionization Modeling of Planetary Nebulae VV28 and M1-11 Authors and Co-Authors : Ramkrishna Das, S. N. Bose National Centre for Basic Sciences; Soumen Mondal, S. N. Bose National Centre for Basic Sciences Abstract Type : Poster Abstract Category : Stars,ISM and the Galaxy Abstract : Planetary nebulae (PNe) form around low to intermediate mass stars due to mass loss from their outer layers in their late evolutionary phases. They provide scope of studying several astrophysical processes, such as, the mechanisms involving the later stages of stellar evolution, dust and molecules formation, gas dynamics, morphologies etc. Here we present spectral analysis of two planetary nebulae, VV28 and M1-11. While VV28 depicts a typical PN spectra, M1-11 shows the characteristics of a low excitation one. We perform photoionization modeling of the spectra using photoionization code Cloudy 17.00. Given the input parameters, Cloudy computes the ionization equilibrium inside a nebula and generates synthetic emission line spectra. The modeling parameters are varied until a satisfactory match of the observed and modeled spectra is obtained and finally optimized with χÂ2 minimization to get the best fit model. We estimate the nebular abundances and density of the hydrogen cloud, the effective temperature & luminosity of the ionizing central star through the modeling. We also estimate the mass of the central star using theoretical stellar evolution trajectories. Finally, we compare the characteristics of the two PNe from our study. |