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We report spectra of the overtone and fundamental bands of CO in the eruptivevariable V838 Mon, which trace the recent evolution of the star and allow itsejecta to be characterized. The data were obtained at the United KingdomInfrared Telescope on fourteen nights from 2002 January, shortly after thefirst outburst of the star, to 2006 April. Although the near-infrared stellarspectrum superficially resembled a cool supergiant after both the first andthird of its outbursts in 2002, its infrared "photosphere" at that timeconsisted of highly blueshifted gas that was moving outward from the originalstellar surface. A spectrum obtained during the third outburst reveals aremarkable combination of emission and absorption in the CO first overtonebands. The most recent observations show a composite spectrum that includes astellar-like photosphere at a temperature similar to that seen just after theinitial outburst, but at a radial velocity redshifted by 15 km/s relative tothe stellar velocity determined from SiO maser emission, suggesting that theatmosphere is now contracting. Three shell components, corresponding toexpansion velocities of 15, 85, and 145 km/s, also are present, but absorptionis seen at all expansion velocities out to 200km/s. Weak absorption features offundamental band lines of 13CO have been detected. However, the largeuncertainty in the value of [12C/13C] does not constrain the evolutionarystatus of the progenitor.Comment: Seven pages, incl. five figures; accepted by A&A, 24 February 200

Infrared spectroscopy of carbon monoxide in V838 Monocerotis during 2002–2006