Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..363..110g&link_type=abstract
The Nature of V838 Mon and its Light Echo ASP Conference Series, Vol. 363, Proceedings of the conference held 16-19 May, 2006 in
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We review our infrared spectroscopy of CO in V838 Mon during 2002-2006. Although the star superficially resembled a cool supergiant after both the first and third of its outbursts, its infrared ``photosphere" consisted of very high velocity gas that must have been well detached from the star itself. A spectrum captured during the third outburst reveals a highly unusual composite spectrum of emission and absorption in the CO first overtone bands. At present a cool stellar photosphere is seen in CO, at a radial velocity redshifted by 15 km s-1 relative to the stellar velocity determined from SiO maser emission. V838 Mon is now truly a red giant, although its photosphere may be contracting and warming. Three shell components, corresponding to expansion velocities of 15, 85, and 145 km s-1, also are present in the spectrum. No lines of 13CO have yet been detected, but the current lower limit, 12C/13C >10, does not tightly constrain the evolutionary status of the progenitor.
Evans Aaron
Eyres Stewart P. S.
Geballe Thomas Ronald
Rushton M. R.
Smalley Barry
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