Abnormal CNO abundances in magnetic cataclysmic variables

Details Abnormal CNO abundances in magnetic cataclysmic variables Abnormal CNO abundances in magnetic cataclysmic variables

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..637...67m&link_type=abstract

CLASSICAL NOVA EXPLOSIONS: International Conference on Classical Nova Explosions. AIP Conference Proceedings, Volume 637, pp. 6

Other

2

Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Unusual And Peculiar Variables, Abundances, Chemical Composition, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae

Scientific paper

We present far-UV observations of three peculiar magnetic cataclysmic variables (MCVs), BY Cam, V1309 Ori and AE Aqr, obtained with the FUSE satellite. Previous IUE spectra of these three objects revealed quite unusual resonance lines compared to other MCVs: an intense NV line and a weak CIV line. The FUSE spectra of these sources exhibit broad OVI lines as well as a strong NIII line at 991Å, while the CIII 1175Å line is nearly absent. Photoionisation models fail to produce the observed line intensities. This confirms non-solar CNO abundances. We discuss possible origins for these peculiar abundances, including the signature of nova thermonuclear runaways (TNR) at the surface of the magnetized white dwarf.

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