Abnormal CNO abundances in magnetic cataclysmic variables

被引：0

作者：

Mouchet, M ^{[1
]}

Bonnet-Bidaud, JM ^{[1
]}

Abada-Simon, M ^{[1
]}

Beuermann, K ^{[1
]}

de Martino, D ^{[1
]}

Ferlet, R ^{[1
]}

Fried, R ^{[1
]}

Gänsicke, B ^{[1
]}

Howell, S ^{[1
]}

Lecavelier, A ^{[1
]}

Mukai, K ^{[1
]}

Porquet, D ^{[1
]}

Roueff, E ^{[1
]}

Szkody, P ^{[1
]}

机构：

[1] Observ Paris, Meudon, France

来源：

CLASSICAL NOVA EXPLOSIONS | 2002年 / 637卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present far-UV observations of three peculiar magnetic cataclysmic variables (MCVs), BY Cam, V 1309 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 991 Angstrom, while the CIII 1175Angstrom 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.

引用

页码：67 / 71

页数：5

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