Abstract Details
| Name: Anindita Mondal Affiliation: S N Bose National Centre for Basic Sciences Conference ID: ASI2018_508 Title : Calculation of H and He emission line fluxes in Novae spectra Authors and Co-Authors : Gargi Shaw, UM-DAE Centre for Excellence in Basic Science, Kalina, Santacruz (East), Mumbai 400098. Ramkrishna Das, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Saltlake, Kolkata 700106. Soumen Mondal, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Saltlake, Kolkata 700106. Abstract Type : Contributed Talk Abstract Category : Stars,ISM and the Galaxy Abstract : Novae provide an astrophysical laboratory in which we can observe the formation and development of exotic emission lines. For a systematic study of novae, a grid model consisting of all the possible parameter sets is considered in order to understand the physical process. From observed spectra, temperature, velocity etc can be calculated. Using the grid model, we can extrapolate the values of other physical parameters, e.g. luminosity, H-density, elemental abundances etc. In this work, we used the photoionization code Cloudy(c17 version) to create a database of line flux ratios of 56 H and He recombination lines (relative to H beta) prominently seen in novae emission spectra, covering a wide wavelength region. Comparing the observed line flux ratios with the modelled one for a set of known observables, we can determine the other parameter values. For the first time, we are able to quantify the observables systematically over a broad range of parameters. We have compared our results for various novae with those found in the literature and the values are well consistent with previously calculated results. We have also used our method to determine the parameters of the novae RS Oph, KT Eri, and V5558 Sgr. |