Changes in the red giant and dusty environment of the recurrent nova RS Ophiuchi following the 2006 eruption
arXiv:0909.1271 · doi:10.1111/j.1365-2966.2009.15675.x
Abstract
We present near infrared spectroscopy of the recurrent nova RS Oph obtained on several occasions after its latest outburst in 2006 February. The 1-5 mircon spectra are dominated by the red giant, but the H I, He I, and coronal lines present during the eruption are present in all our observations. From the fits of the computed infrared spectral energy distributions to the observed fluxes we find T_eff=4200+/-200,K for the red giant. The first overtone CO bands at 2.3 micron, formed in the atmosphere of the red giant, are variable. The spectra clearly exhibit an infrared excess due to dust emission longward of 5 micron; we estimate an effective temperature for the emitting dust shell of 500K, and find that the dust emission is also variable, being beyond the limit of detection in 2007. Most likely, the secondary star in RS Oph is intrinsically variable.
7 pages, 6 figures, accepted for publication in MNRAS
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- First Overtone CO Bands in the Giant Component of RS Ophiuchi: the 12C/13C Ratio in 2008
- Modelling the spectral energy distribution of the red giant in RS Ophiuchi: evidence for irradiation
- The recurrent nova V3890~Sgr: a near-infrared and optical study of the red giant component and its environment
- The symbiotic system AG Draconis. Soft X-ray bremsstrahlung from the nebulae
- Rise and fall of silicate dust in RS Ophiuchi following the 2006 eruption