The spectrum of the Intermediate Polar AE Aqr shows broad and strong emission lines of N iii + He ii (990), O vi (doublet), and He ii (1085). We note, however, the absence of the usually strong C iii (977 \& 1175) emission lines; instead, we tentatively identify these lines with the weak spectral features there. Weak broad emission lines of S iv (1063 \& 1073) and N iv (923) are detected. The S vi (933 & 944) emission lines which are sometime seen in systems exhibiting a variety of rich emission lines (e.g. such as e.g. DW UMa, Hoard et al 2003) are not detected at all but they are marked in the figure. The FUSE exposures cover the entire orbital phase and the spectrum was obtained by combining the exposures obtained when the emission from the poles is minimal. However, the contribution from the white dwarf produces only a very weak continuum, while the matter shocked at the poles emits the broad and strong emission lines. This object exhibits the N/C anomaly indicative of CNO processing, as first noted in studies at longer UV wavelengths (Gaensicke et al. 2003).

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FUSE Data

Synthetic Spectrum

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Click to see larger version of the plot

These data and models were published in the paper:

Godon, P., Sion, E.M., Levay, K., Linnell, A.P., Szkody, P., Barrett, P.E., Hubeny, I., Blair, W.P., 2012, ApJS, in press

Notes on figures:

When a model is shown, the portions of the observed spectrum that have been masked before the spectral fit are in blue, while the rest of the observed spectrum is in red. The model fit is shown the solide line in black (or possibly white). If the model is a composite made of a disk model and a white dwarf model, then these are shown with the dashed- and dotted lines (respectively). Some models include the effect of quasi-molecular HI absorption features, these are labelled "Q-mol" in the spectrum.