2009MNRAS.398..375D -
Mon. Not. R. Astron. Soc., 398, 375-384 (2009/September-1)
Detection and evolution of the CO (Δv = 2) emission in nova V2615 Ophiuchi.
DAS R.K., BANERJEE D.P.K. and ASHOK N.M.
Abstract (from CDS):
We present near-infrared (1-2.5 µm) spectroscopic and photometric results of Nova V2615 Ophiuchi which was discovered in outburst in 2007 March. Our observations span a period of ∼80 d starting from 2007 March 28 when the nova was at its maximum light. The evolution of the spectra is shown from the initial P Cygni phase to an emission-line phase and finally to a dust formation stage. The characteristics of the JHK spectra are very similar to those observed in a nova outburst occurring on a carbon-oxygen white dwarf. We analyse an observed line at 2.088 µm and suggest that it could be due to Feii excited by Lyman α fluorescence. The highlight of the observations is the detection of the first overtone bands of carbon monoxide (CO) in the 2.29-2.40 µm region. The CO bands are modelled to estimate the temperature and mass of the emitting CO gas and also to place limits on the 12C/13C ratio. The CO bands are recorded over several epochs, thereby allowing a rare opportunity to study the evolution from a phase of constant strength through a stage when the CO is destroyed fairly rapidly. We compare the observed time-scales involved in the evolution of the CO emission and find a good agreement with model predictions that investigate the chemistry in a nova outflow during the early stages.
Abstract Copyright:
© 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s):
line: identification - techniques: spectroscopic - stars: individual: V2615 Oph - novae, cataclysmic variables
Simbad objects:
16
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