The peculiar variable V838 Monocerotis

Abstract

Spectroscopic observations of the peculiar variable V838 Mon during the period from the second light outburst until the fast dimming are presented. We describe high resolution high spectra obtained a day before the second light maximum and low resolution spectra covering the whole period. The temporal run of intensities and radial velocities of various lines is presented. Using D IS lines we determine the reddening distance of V838 Mon kpc, and kinematic distance kpc. We estimate that V838 Mon is slightly metal deficient but otherwise has a quite solar-like chemical composition except for enhanced abundances of Li, Ba and La.