| Autor: |
A. Evans, M. J. Darnley, Frederick M. Walter, B. J. M. Hassall, Michael F. Bode, M. B. N. Kouwenhoven, S. P. S. Eyres, M. T. Rushton, Hannah L. Worters, M. P. Maxwell |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society. 419:1465-1471 |
| ISSN: |
0035-8711 |
| DOI: |
10.1111/j.1365-2966.2011.19803.x |
| Popis: |
U Scorpii is a recurrent nova which has been observed in outburst on 10 occasions, most recently in 2010. We present near-infrared and optical spectroscopy of the 2010 outburst of U Sco. The reddening of U Sco is found to be $E(B-V) = 0.14\pm0.12$, consistent with previous determinations, from simultaneous optical and near-IR observations. The spectra show the evolution of the line widths and profiles to be consistent with previous outbursts. Velocities are found to be up to 14000\,kms$^{-1}$ in broad components and up to 1800\,kms$^{-1}$ in narrow line components, which become visible around day 8 due to changes in the optical depth. From the spectra we derive a helium abundance of $N$(He)/$N$(H)$ = 0.073\pm0.031$ from the most reliable lines available; this is lower than most other estimates and indicates that the secondary is not helium-rich, as previous studies have suggested. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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