Modelling spectra of MN112

Abstract

© 2020 The Author(s). MN112 is a Galactic luminous blue variable (LBV) candidate with a circumstellar nebula. P Cygni was the first LBV discovered, and was recorded during major eruptions in the 17th century. The stars have similar spectra with strong emission hydrogen lines, He I, NII, SiII, and FeIII lines. We present the results of spectroscopic analysis and modelling of MN112 spectra. We obtained the main stellar parameters and chemical abundances of MN112 and compared them with those of P Cygni. Atmosphere models were calculated using the non-local thermodynamic equilibrium radiative transfer code CMFGEN. We have used spectra of MN112 obtained with the 3.5-m telescope at the Observatory of Calar Alto and 3.5-m ARC telescope at the Apache Point Observatory. P Cygni spectra were taken with the 6-m BTA telescope. We have found the best fit of the observed spectrum with the model at temperature Teff = 15 200 K, clumping-corrected mass-loss rate Mf-.5 = 5.74 × 10-5 M0yr-1, filling factor f = 0.1, luminosity L = 5.77 × 105 L0 for MN112. The ratio of helium to hydrogen He/H is 0.27 (by the number of atoms) with nitrogen overabundance (XN/XQ = 6.8) and an underabundance of carbon (XC/XQ < 0.1).