Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-21
Mon.Not.Roy.Astron.Soc. 341 (2003) 785
Astronomy and Astrophysics
Astrophysics
7 pages, 7 figures - accepted for MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06441.x
The unusual eruptive variable discovered in Monoceros in 2002 January underwent dramatic photometric and spectroscopic changes in the months prior to its 2002 June-August conjunction with the Sun. Optical and infrared (IR) photometry obtained at the South African Astronomical Observatory (SAAO) between 2002 January and June (JD 2452280-440) is presented here in an analysis of the star's post-outburst behaviour. The light curve indicated 3 eruptions took place in 2002 January, February and March. SAAO echelle spectra obtained in the week prior to the March maximum indicated the ejection of a new shell of material. JHKL photometry obtained during 2002 April showed the development of an IR excess due to the formation of a dust shell. The shell appears to be largely responsible for the rapid fade in the optical flux during 2002 April-May (Delta V > 6 mag within 3 weeks). Blueing of the optical colours during the decline is likely due either to the revealing of an emission line region surrounding V838 Mon, or the unveiling of the progenitor or a spatially-close early-type star.
Crause Lisa A.
Jones Albert F.
Kilkenny David
Lawson Warrick A.
Marang Fred
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