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The Helium Abundance in the Ejecta of U Scorpii

Published online by Cambridge University Press:  17 January 2013

M. P. Maxwell ,
M. T. Rushton ,
M. J. Darnley ,
H. L. Worters ,
M. F. Bode ,
A. Evans ,
S. P. S. Eyres ,
M. B. N. Kouwenhoven ,
F. M. Walter  and
B. J. M. Hassall
M. P. Maxwell
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, England email: mpmaxwell@uclan.ac.uk
M. T. Rushton
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, England email: mpmaxwell@uclan.ac.uk
M. J. Darnley
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Birkenhead, CH41 1LD
H. L. Worters
Affiliation:
South African Astronomical Observatory, PO Box 9, 7935 Observatory, South Africa
M. F. Bode
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Birkenhead, CH41 1LD
A. Evans
Affiliation:
Astrophysics Group, Keele University, Keele, Staffordshire, ST5 5BG
S. P. S. Eyres
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, England email: mpmaxwell@uclan.ac.uk
M. B. N. Kouwenhoven
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Haidian Qu, Beijing 100871, China
F. M. Walter
Affiliation:
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA
B. J. M. Hassall
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, England email: mpmaxwell@uclan.ac.uk
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Abstract

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U Scorpii was observed in outburst for the tenth time in January 2010. We obtained optical and near-infrared spectroscopy from which we derive a helium abundance of N(He)/N(H) = 0.056±0.020 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. Velocities are found to be up to 14,000 km s−1 in broad components and up to 1,800 km s−1 in narrow line components. The reddening of U Sco is found to be E(B-V) = 0.14 ± 0.12.

Keywords

stars: novaecataclysmic variablesabundancesindividual (U Scorpii)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Issue S281: Binary Paths to Type Ia Supernovae Explosions , July 2011 , pp. 190 - 192
Copyright
Copyright © International Astronomical Union 2013

References

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