The absorption spectrum of V838 Mon in 2002 February–March — I. Atmospheric parameters and iron abundance

• Published in: Monthly notices of the Royal Astronomical Society Vol. 357; no. 1; pp. 38 - 44
• Main Authors: Kaminsky, Bogdan M., Pavlenko, Yakiv V.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 11.02.2005; Blackwell Science
• Subjects: stars: abundances; stars: atmospheres; stars: individual: V838 Mon; stars: atmospheres; Physical parameter; stars: individual: V838 Mon; Effective temperature; Abundance; Absorption spectra; stars: abundances
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1111/j.1365-2966.2004.08551.x

We present a determination of the effective temperatures, iron abundances and microturbulent velocities for the pseudo-photosphere of V838 Mon on 2002 February 25, and March 2 and 26. Physical parameters of the line-forming region were obtained in the framework of a self-consistent approach, using fits of synthetic spectra to observed spectra in the wavelength range 5500-6700 Å. We obtained Teff = 5330 ± 300, 5540 ± 270 and 4960 ± 190 K, for February 25, March 2, and March 26, respectively. The iron abundance log N(Fe) = −4.7 does not appear to change in the atmosphere of V838 Mon from 2002 February 25 to March 26.