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Table 2

Emission lines in the RGS spectrum of RR Tel.

Wavelength Ion Observed Flux C/d.o.f.*
Å 10-14 erg cm-2 s-1

18.63 O VII <0.36 257/209
18.97 O VIII 1.05 +/– 0.40 ′′
21.60 O VII (r) 2.27 +/– 0.78 164/154
21.80 O VII (i) <0.36 ′′
22.09 O VII (f) 1.91 +/– 0.49 ′′
24.78 N VII 1.19 +/– 0.44 301/282
28.78 N VI (r) 1.32 +/– 0.73 477/376
29.08 N VI (i) <0.41 ′′
29.54 N VI (f) 1.21 +/– 0.48 ′′
33.73 C VI 0.94 +/– 0.45 112/98
Diagnostics.

G a R b R ion c T e N e
MK cm-3

Oxygen 0.8–1.0 >3.7 0.5 1.4–2.1 <7 × 108
Nitrogen 0.9–1.2 >2.0 0.9 0.5–1.0 <8 × 109

Notes.

*

C: value of the C-statistic, d.o.f.: degrees of freedom

(a)

G = (i + f)/r.

(b)

R = f/i.

(c)

Rion: ratio of H-like and He-like resonance lines.

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