Table 2: Spectral lines identified in the first order XMM-Newton RGS spectrum of TW Hya. left - Observed line center, width, number of counts, and photon flux. Uncertainties include statistical 1$\sigma $ error plus a systematic error stemming from the uncertainty of the local background level (see text for details). right - Line identifications from Mewe85.1, Mewe95.1, and Phillips99.1. For line blends we list the most likely contributors according to X-ray observations of other stars.
$\lambda$ $\sigma $ I Photon Flux Identification
[Å] [Å] [cts] [ $10^{-5}~\frac{\rm ph}{\rm s~cm^2}$] Ion Trans. $\lambda$
RGS 1
18.983 0.055 $465.7 \pm 43.7$ $30.4 \pm 2.8$ O VIII $Ly_\alpha $ 18.97
21.616 0.047 $241.6 \pm 28.4$ $17.4 \pm 2.1$ O VII r 21.61
21.836 0.053 $128.2 \pm 20.1$ $ 9.5 \pm 1.5$ O VII i 21.80
22.100 0.037 $ 5.3 \pm 7.1$ $ 0.4 \pm 0.6$ O VII f 22.10
RGS 2
12.152 0.060 $111.4 \pm 26.1$ $ 6.3 \pm 1.5$ Ne X $Ly_\alpha $ 12.13
13.460 0.050 $402.0 \pm 38.1$ $23.1 \pm 2.2$ Ne IX r 13.45
13.560 0.057 $308.9 \pm 19.9$ $17.4 \pm 1.1$ Ne IX i 13.55
13.710 0.054 $149.7 \pm 27.3$ $ 8.2 \pm 1.5$ Ne IX f 13.70
17.065 0.075 $ 46.8 \pm 15.9$ $ 2.7 \pm 0.9$ Fe XVII Ne3G 17.06
24.793 0.060 $171.5 \pm 31.5$ $11.8 \pm 2.2$ N VII $Ly_\alpha $ 24.78
28.820 0.059 $ 32.1 \pm 14.2$ $ 2.9 \pm 1.3$ N VI r 28.79
29.101 0.030 $ 14.2 \pm 7.2$ $ 1.3 \pm 0.6$ N VI i 29.10
29.540 0.030 $ 4.3 \pm 5.8$ $ 0.4 \pm 0.5$ N VI f 29.54
RGS 1 + RGS 2
16.030 0.056 $118.7 \pm 37.2$ $ 3.5 \pm 1.1$ Fe XVIII   16.00
        O VIII $Ly_\beta$ 16.01
18.649 0.037 $ 53.4 \pm 12.1$ $ 1.7 \pm 0.4$ O VII He3A 18.63
33.757 0.065 $113.9 \pm 20.7$ $ 7.8 \pm 1.4$ C VI $Ly_\alpha $ 33.70


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