A&A 395, 161-167 (2002)
DOI: 10.1051/0004-6361:20021243
Near infra-red spectroscopy of V838 Monocerotis
D. P. K. Banerjee and N. M. AshokPhysical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
(Received 10 June 2002 / Accepted 27 August 2002 )
Abstract
Near - IR, multi - epoch, spectroscopic and photometric observations of the
enigmatic, eruptive variable V838 Mon in the
JHK bands are reported.
One of the unusual features of the spectra is the detection
of several strong neutral TiI lines in emission in the
K band. From
the strength of these lines, the mass of the ejected envelope is
estimated to be in the range 10
-7 to 10
.
The spectra also show the strong presence of the first and second
overtone
12CO bands seen in the
K and
H bands. The CO bands show
a complex evolution. Deep
water bands at 1.4
m and 1.9
m are also seen later
in the object's evolution. Blackbody fits to the
JHK photometric data
show that V838 Mon has evolved to temperatures between 2400-2600 K
by ~130 days after outburst. The spectra at this stage have the
general characteristics of a very cool M giant.
Key words: stars: individual: V838 Mon -- stars: supergiants -- infrared: stars -- stars: novae -- techniques: spectroscopic
Offprint request: D. P. K. Banerjee, orion, ashok@prl.ernet.in
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