Table 4.
Oxygen abundances from comparison of strong line ratios with models and from empirical calibrations.
| ID | Spectrum | Eq. (1) | Eq. (3) | Pilyugin & Grebel (2016) | log(N/H) |
|---|---|---|---|---|---|
| 1 | Nucleus A | 8.23 ± 0.17 | 8.37 ± 0.14 | 8.25 ± 0.04 | −1.64 |
| 2 | Region B | 8.68 ± 0.02 | 8.67 ± 0.03 | 8.32 ± 0.01 | −1.33 |
| 3 | Region C | 8.68 ± 0.02 | 8.71 ± 0.02 | 8.37 ± 0.01 | −1.38 |
| 4 | R15-minusABC | 8.34 ± 0.08 | 8.48 ± 0.06 | 8.34 ± 0.03 | – |
| 5 | R30–R15 | 8.50 ± 0.06 | 8.55 ± 0.06 | 8.30 ± 0.03 | −1.51 |
| 6 | R40 | 8.29 ± 0.11 | 8.45 ± 0.09 | 8.33 ± 0.03 | −1.66 |
Notes. Columns 3 and 4 list the oxygen abundances in solar units for the six spectra derived from Eqs. (1) and (3). Column 5 (unit: 12+log(O/H)) lists the abundances from Eq. (6) of Pilyugin & Grebel (2016). The nitrogen abundance has been calculated using Eq. (4).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.