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The spectral evolution and ejecta of recurrent nova U Sco in the 2010 outburst

Synoptic spectroscopic observations of the U Sco 2010 outburst from maximum light to quiescence as well as a contemporaneous X-ray observation are presented and analyzed. The X-ray spectrum 52 days after outburst indicates a hot source (kTbb ~ 70 eV). . Narrow line components from the irradiated companion atmosphere were observed in hydrogen and helium optical recombination lines. The formation of a nebular spectrum is seen for the first time in this class of recurrent novae, allowing a detailed study of the ejecta using photoionization models. Unusual [OIII] auroral-to-nebular line ratios were found and possible scenarios of their origin are discussed. The modeling of the emission line spectrum suggests a highly heterogeneous ejecta with mass around or above 3 x 10-6 Msun

preprint2010arXivOpen access
M. P. DiazR. E. WilliamsG. J. LunaM. MoraesL. Takeda
astro-ph.HEastro-ph.SR
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M. P. DiazR. E. WilliamsG. J. LunaM. MoraesL. Takeda

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