Volume 378, Number 1, October IV 2001
|Page(s)||132 - 141|
|Section||Interstellar and circumstellar matter|
|Published online||15 October 2001|
Infrared spectroscopy of the 1999 outburst of U Scorpii*
Department of Physics, Keele University, Keele, Staffs, ST5 5BG, UK
2 Landessternwarte, Königstuhl, 69117 Heidelberg, Germany e-mail: J.Krautter@lsw.uni-heidelberg.de
3 European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: firstname.lastname@example.org
4 Department of Physics & Astronomy, Arizona State University, PO Box 871504, Tempe, AZ 85287-1504, USA e-mail: email@example.com
Corresponding author: A. Evans, firstname.lastname@example.org
Accepted: 9 August 2001
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 .
Key words: stars: individual: U Sco / stars: novae, cataclysmic variables / infrared: stars
© ESO, 2001
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