Table 2
Chemical abundances derived from the best fit, in mass fraction and relative to solar abundances from Asplund et al. (2009).
| IGR J17544-2619 | Vela X-1 | ||||
|
|
|||||
| Chemical | Mass fraction | Rel. | Mass fraction | Rel. | |
| element | Ab. | Ab. | |||
|
|
|||||
| H | (6.2 ± 0.5)E−01 | 0.85 | (6.5 ± 0.5)E−01 | 0.89 | |
| He | (3.7 ± 0.5)E−01 | 1.47 | (3.4 ± 0.5)E−01 | 1.35 | |
| C | (5.0 ± 3.0)E−04 | 0.17 | (5.0 ± 3.0)E−04 | 0.17 | |
| N | (2.2 ± 0.6)E−03 | 2.58 | (1.8 ± 0.6)E−03 | 2.11 | |
| O | (6.0 ± 2.0)E−03 | 0.76 | (7.0 ± 0.2)E−03 | 0.88 | |
| Si | (7.3 ± 2.0)E−04 | 1.00 | (5.5 ± 2.0)E−04 | 0.75 | |
| S | 5.0E−04 | 1.00 | 5.0E−04 | 1.00 | |
| P | 6.4E−06 | 1.00 | 6.4E−06 | 1.00 | |
| Al | 5.8E−05 | 1.00 | 7.0E−05 | 1.00 | |
| Mg | 7.0E−04 | 1.00 | 7.0E−04 | 1.00 | |
| Fe a | 1.4E−03 | 1.00 | 1.4E−03 | 1.00 | |
Notes.
Fe actually stands for a generic atom, including iron group elements Sc, Ti, V, Cr, Mn, Co and Ni. For more details see Gräfener et al. (2002).
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