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Paper: Integral Field Unit Spectroscopy of the Helium Nova V445 Puppis
Volume: 490, Stella Novae: Past and Future Decades
Page: 115
Authors: Macfarlane, S.; Steeghs, D.; Woudt, P.
Abstract: We report results from integral field unit (IFU) spectroscopy of the unique helium nova V445 Pup (Nova Puppis 2000) over two epochs, one year apart. The IFU spectra clearly resolve the dynamics of the ejecta spatially, with distinct signatures from either side of the bipolar nova shell, and the fast moving knots at both extremes of the shell. The latter are characterized by strong [O III] 4959,5007 Å and [O II] 7320/7330 Å emission, and little to no He I. The angular expansion of the knots, as measured by the [O III] and [O II] lines is ∼ 0.2” over the one-year baseline of the observations. This agrees with the 0.217” yr-1 knot expansion observed in the Ks VLT/NACO imaging reported by Woudt et al. (2009) and confirms the association of the oxygen-dominated spectra with the knots.
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