Spectroscopy of Post-AGB A-Supergiant HD 101584 (IRAS 11385–5517)

Abstract

In the high resolution optical spectra we identified forbidden lines of {[}01] and {[}CI], which indicate the presence of low excitation nebula. There are many emission lines due forbidden and permitted lines of neutral and singly ionised metals. The Hoe, Fell 6383Angstrom, NaI D-1, D-2 lines and the Call IR triplet lines show P-Cygni profiles indicating a mass outflow. From the spectrum synthesis analysis of NI lines, we find the atmospheric parameters to be T-eff=8500K, log g=1.5, V-turb=13km s(-1) and {[}Fe/H]=0.0. Carbon and nitrogen are found to be overabundant. From the analysis of Fe emission lines and forbidden lines, we derived T-exi = 6100K +/- 200 for the emission line region.