Spitzer and ground-based infrared observations of the 2006 eruption of RS Ophiuchi

A. Evans; C. E. Woodward; L. A. Helton; R. D. Gehrz; D. K. Lynch; R. J. Rudy; R. W. Russell; T. Kerr; M. F. Bode; M. J. Darnley; S. P. S. Eyres; T. R. Geballe; T. J. O'Brien; R. J. Davis; S. Starrfield; J. -U. Ness; J. Drake; J. P. Osborne; K. L. Page; G. Schwarz; J. Krautter

doi:10.1086/519924

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arXiv · 0705.2414

Spitzer and ground-based infrared observations of the 2006 eruption of RS Ophiuchi

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Abstract

We present Spitzer Space Telescope and complementary ground-based infrared observations of the recurrent nova RS Ophiuchi, obtained over the period 64-111 days after the 2006 eruption. The Spitzer IRS data show a rich emission line spectrum superimposed on a free-free continuum. The presence of fine structure and coronal infrared lines lead us to deduce that there are at least two temperatures (1.5e5K and 9e5K) in the ejecta/wind environment, and that the electron density in the `cooler' region is 2.2e5 cm-3. The determination of elemental abundances is not straightforward but on the assumption that the Ne and O fine structure lines arise in the same volume of the ejecta, the O/Ne ratio is >~0.6 by number.

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A. Evans, C. E. Woodward, L. A. Helton, R. D. Gehrz, D. K. Lynch, R. J. Rudy, R. W. Russell, T. Kerr, M. F. Bode, M. J. Darnley, S. P. S. Eyres, T. R. Geballe, T. J. O'Brien, R. J. Davis, S. Starrfield, J. -U. Ness, J. Drake, J. P. Osborne, K. L. Page, G. Schwarz, J. Krautter. 2007-05-16. Spitzer and ground-based infrared observations of the 2006 eruption of RS Ophiuchi. https://doi.org/10.1086/519924

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