This article has an erratum: [erratum]
Volume 532, August 2011
|Number of page(s)||4|
|Published online||03 August 2011|
Letter to the Editor
U Scorpii 2010 outburst: observational evidence of an underlying ONeMg white dwarf⋆
Space Telescope Science Institute (STScI),
3700 S. Martin Dr.,
Received: 8 June 2011
Accepted: 18 July 2011
This paper presents U Sco nebular spectra collected in the period March–May 2010 after the binary outburst on Jan. 28, 2010. The spectra display strong [Nev] and [Neiii] lines that can be used to compute the relative abundance of [Ne/O]. The value obtained ([Ne/O] = 1.69) is higher than the typical [Ne/O] abundance found in classical novae from CO progenitors and suggests that U Sco has a ONeMg white-dwarf progenitor. It follows that U Sco will not explode as a SN Ia but rather collapse to become a neutron star or a millisecond pulsar.
Key words: novae, cataclysmic variables / stars: individual: USco
© ESO, 2011
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