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Table 2.
Simulated elemental abundances and isotopic ratios (see text) compared to ones observed in CK Vul.
| Element | H-envelope | He-core | Mixed | CK Vul | Mixed | H-envelope | He-core |
|---|---|---|---|---|---|---|---|
| (outer 0.1 M⊙) | fHe = 0.40 | fHe = 0.40 | (outer 0.1 M⊙) | ||||
| Integrated Tycho mass fraction |
Observed | Integrated MESA mass fraction |
|||||
| H (a) | 0.74 | 0.00 | 0.44 | 0.49 | 0.43 | 0.72 | 0.00 |
| He (a) | 0.25 | 1.00 | 0.55 | 0.51 | 0.56 | 0.28 | 1.00 |
| C | 7.6 × 10−4 | 6.0 × 10−5 | 4.8 × 10−4 | (7 × 10−4)(b) | 3.8 × 10−4 | 5.9 × 10−4 | 5.6 × 10−5 |
| N (a) | 2.2 × 10−4 | 2.6 × 10−3 | 1.2 × 10−3 | 1.2 × 10−3 | 1.2 × 10−3 | 3.2 × 10−4 | 2.6 × 10−3 |
| O (a) | 1.8 × 10−3 | 6.1 × 10−5 | 1.1 × 10−3 | 9.5 × 10−4 | 1.1 × 10−3 | 1.9 × 10−3 | 3.3 × 10−5 |
| F | 1.6 × 10−7 | 2.0 × 10−10 | 9.5 × 10−8 | (> 2.3 × 10−7)(c) | 3.3 × 10−10 | 5.6 × 10−10 | 3.1 × 10−12 |
| Ne (a) | 4.0 × 10−4 | 3.4 × 10−4 | 3.8 × 10−4 | 7.3 × 10−4 | 3.9×10−4 | 4.2×10−4 | 3.4×10−4 |
| S | 9.8 × 10−5 | 9.8 × 10−5 | 9.8 × 10−5 | 8.9 × 10−5 | |||
| Ar | 2.1 × 10−5 | 2.1 × 10−5 | 2.1 × 10−5 | 2.4 × 10−5 | |||
| Integrated Tycho number ratio |
Observed | Integrated MESA number ratio |
|||||
| C/O | 0.55 | 1.28 | 0.57 | ∼1 (b) | 0.44 | 0.31 | 1.68 |
| N/O | 0.14 | 48.6 | 1.19 | 1.38 | 1.22 | 0.17 | 77.97 |
| F/O | 7.4 × 10−5 | 2.7 × 10−6 | 7.3 × 10−5 | (> 2 × 10−4) (c) | 2.5 × 10−7 | 3.0 × 10−7 | 9.6 × 10−8 |
| 12C/13C | 99. | 3.5 | 48. | 3.8 | 28.7 | 30.2 | 4.3 |
| 14N/15N | 470. | 28 000. | 3700. | 20.0 | 847 | 457. | 23 200. |
| 16O/17O | 2780. | 9.6 | 410.0 | ≳180. | 2330 | 2338. | 999. |
| 16O/18O | 590. | 26 000. | 600.0 | 36.0 | 501 | 500. | 1.3 × 106 |
| 27Al/26Al | ∞ | 2.4 | 6.0 | 7.0 | |||
Notes.
(c)
A rough lower limit; see Sect. 2.7.
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