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Paper: Silicate Dust in RS Ophiuchi
Volume: 490, Stella Novae: Past and Future Decades
Page: 249
Authors: Rushton, M. T.; Woodward, C. E.; Helton, L. A.; Gehrz, R. D.; Evans, A.; Kaminsky, B.; Pavlenko, Y. V.; Eyres, S. P. S.; Maxwell, M.
Abstract: We present Spitzer IRS spectra of the recurrent nova RS Ophiuchi obtained between 2006 and 2009. The data show emission lines due to HI, [Ne II], [Ne V], [Ne VI] and [O IV] and the well known silicate features at 10 μm and 18 μm, whose behaviour are reported here. The silicate features are variable in the period covered by the observations, appearing strongest in our 2007 data. Interestingly, the central wavelength of the 18 μm band is shorter than observed in other symbiotic systems and other circumstellar environments, suggesting unusual grain properties in RS Oph. We report changes that have taken place in the dusty environment in RS Oph and investigate the properties of the dust grains.
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