Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-07
Astrophys.J.647:L131-L134,2006
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures, accepted for publication in The Astrophysical Journal Letters
Scientific paper
10.1086/507465
BD+303639, the brightest planetary nebula at X-ray energies, was observed with Suzaku, an X-ray observatory launched on 2005 July 10. Using the X-ray Imaging Spectrometer, the K-lines from C VI, O VII, and O VIII were resolved for the first time, and C/O, N/O, and Ne/O abundance ratios determined. The C/O and Ne/O abundance ratios exceed the solar value by a factor of at least 30 and 5, respectively. These results indicate that the X-rays are emitted mainly by helium shell-burning products.
Arnaud Keith
Hamaguchi Kenji
Hayashida Kiyoshi
Kokubun Motohide
Kotoku Jun
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