Table 2
Fit results when attempting four different models (columns) to account for the soft excess on 2 data sets (rows).
| NS atmosphere model | Reflection model | Double black body | “fa” model |
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Time interval: 2–5 s ( with ν = 268 for black body fit) |
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 (ν = 268) |
 (ν = 266) |
 (ν = 266) |
 (ν = 267) |
| L/LEdd = 0.501 ± 0.004 | log ξ = 3.60 ± 0.03 | kT1 = 0.620 ± 0.017 | kT = 1.985 ± 0.009 |
| R = 16.49 ± 0.09 km | kT = 2.27 ± 0.03 | F1 = 18% | Fbb = 63% |
| R = 10.0 ± 12.8 | kT2 = 2.082 ± 0.013 | fa = 16.6 ± 0.6 | |
| (nH = 1020 cm-3) | F2 = 82% | Ffa = 37% | |
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|
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Time interval: 12–16 s ( with ν = 148 for black body fit) |
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 (ν = 148) |
 (ν = 146) |
 (ν = 146) |
 (ν = 147) |
| L/LEdd = 0.293 ± 0.002 | log ξ = 3.61 ± 0.14 | kT1 = 1.593 ± 0.046 | kT = 1.790 ± 0.007 |
| R = 13.76 ± 0.08 km | kT = 1.84 ± 0.02 | F1 = 73% | Fbb = 80% |
| R = 0.38 ± 0.24 | kT2 = 2.82 ± 0.34 | fa = 3.7 ± 0.3 | |
| (nH = 1020 cm-3) | F2 = 27% | Ffa = 20% | |
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Notes. First order LETGS spectra were combined and binned to 15 photons per bin. The figures show the deconvolved spectra (top panels; in units of phot cm-2 s-1 keV-1) and their relative deviation (i.e., data divided by the predicted model value; bottom panels) with respect to the models. Black curves are for LETGS and red for RXTE data. The y-axes for the bottom panels have identical scales. (Color version of table available in online version.)
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