Infrared spectroscopy of the 1999 outburst of U Scorpii

A. Evans, J. Krautter, L. Vanzi, S. Starrfield

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18 Scopus citations

Abstract

We present infrared spectroscopy of the recurrent nova U Sco, obtained during the 1999 eruption. The 0.94... 2.4 μm spectrum is dominated by H I, He I and He II emission lines and the pseudophotosphere of the hot white dwarf. The ejected material is overabundant in He and O; we estimate He/H ≃ 4.5 ± 1.7 and O/H ≃ 0.013 by number, for electron temperature 2 × 104 K. There appears to be excess emission longward of ∼ 1.4 μm, 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 2.7 (±0.9) × 10-7 M⊙.

Original languageEnglish (US)
Pages (from-to)132-141
Number of pages10
JournalAstronomy and Astrophysics
Volume378
Issue number1
DOIs
StatePublished - Oct 2001

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Keywords

  • Infrared: stars
  • Stars: cataclysmic variables
  • Stars: individual: U Sco

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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