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We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94...2.4μm spectrum is dominated by Hi, Hei and Heii emission lines and the pseudo photosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H and O/H by number, for electron temperature K. There appears to be excess emission longward of ~1.4μm, which is likely to be due to free-free emission by the material ejected in the 1999 eruption; from this we deduce an ejected mass of .
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Evans et al. (2001) studied this question.
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