Open Access
Table 11
NGC 4361 Comparison of abundances for extended nebula and freckles.
| Ionic ratio | Nebula | Freckles |
|---|---|---|
| He+/H+ | 0.0038 | 0.0918 |
| He++/H+ | 0.0950 | <0.02 |
| He/H+ | 0.0988 | 0.111 |
| N+/H+ | 2.38×10−8 | 2.04 × 10−5 |
| N/H+ (*) | 7.84 × 10−6 | 4.06 × 10−5 |
| N/H+ (†) | 6.68 × 10−6 | 3.73 × 10−5 |
| O+/H+ | 6.06 × 10−7 | 2.52 × 10−4 |
| O++/H+ | 2.22 × 10−5 | 1.21 × 10−4 |
| O/H+ (*) | 1.99 × 10−4 | 5.03 × 10−4 |
| O/H+ (†) | 2.42 × 10−4 | 4.94 × 10−4 |
| N+/O+ | 0.0393 | 0.0807 |
| N/O (*) | 0.0393 | 0.0807 |
| N/O (†) | 0.0276 | 0.0755 |
| S+/H+ | 3.13 × 10−9 | 4.41 × 10−7 |
| S++/H+ | 1.69 × 10−7 | 1.41 × 10−6 |
| S/H+ (*) | 8.25 × 10−7 | 1.94 × 10−6 |
| S/H+ (†) | 3.93 × 10−6 | 2.40 × 10−6 |
Notes. (*) Calculated with Kingsburgh & Barlow (1994) ICF;(†) calculated with Delgado-Inglada et al. (2014) ICF.
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