Table 4
Best-fit Zeeman broadening results for ϵ Eridani.
| Two-component model | |||||
|---|---|---|---|---|---|
| Parameter | 21 September | 22 September | 24 September | 25 September | Average |
| Teff (K) | 5010 | ||||
| log g (cgs) | 4.53 | ||||
| v sin i (km s−1) | 2.59 | ||||
| ξmic (km s−1) | 0.99 | ||||
| ξmac (km s−1) | 4.93 ± 0.24 | 3.03 ± 0.24 | 3.34 ± 0.18 | 3.19 ± 0.22 | 3.26 ± 0.17 |
| Metallicity | 0.038 ± 0.007 | 0.024 ± 0.010 | 0.015 ± 0.008 | 0.012 ± 0.009 | 0.022 ± 0.010 |
| Bmono (G) | 1898 ± 129 | 1812 ± 136 | 1846 ± 133 | 1783 ± 135 | 1835 ± 43 |
| Filling factor | 0.125 ± 0.017 | 0.159 ± 0.023 | 0.126 ± 0.018 | 0.141 ± 0.021 | 0.138 ± 0.014 |
| Multi-component model | |||||
| Parameter | 21 September | 22 September | 24 September | 25 September | Average |
| Teff (K) | 5010 | ||||
| log g (cgs) | 4.53 | ||||
| v sin i (km s−1) | 2.59 | ||||
| ξmic (km s−1) | 0.99 | ||||
| ξmac (km s−1) | 5.02 ± 0.21 | 3.22 ± 0.19 | 3.44 ± 0.19 | 3.40 ± 0.18 | 3.40 ± 0.12 |
| Metallicity | 0.048 ± 0.012 | 0.029 ± 0.016 | − 0.008 ± 0.015 | 0.005 ± 0.014 | 0.019 ± 0.022 |
| f0 kG | 0.831 ± 0.043 | 0.840 ± 0.057 | 0.850 ± 0.054 | 0.859 ± 0.051 | 0.845 ± 0.011 |
| f2 kG | 0.118 ± 0.017 | 0.131 ± 0.023 | 0.140 ± 0.022 | 0.129 ± 0.020 | 0.130 ± 0.008 |
| f4 kG | 0.000 ± 0.022 | 0.028 ± 0.028 | 0.009 ± 0.026 | 0.010 ± 0.025 | 0.012 ± 0.010 |
| f6 kG | 0.050 ± 0.033 | 0.000 ± 0.044 | 0.000 ± 0.042 | 0.000 ± 0.040 | 0.013 ± 0.021 |
Notes. The results are presented for the two-component model and for a multi-component model that provides limits on the presence of stronger magnetic fields. The parameters without uncertainties were fixed based on a fit to the visible spectrum. The final column contains averages over the four nights, where the standard deviation is used as the uncertainty.
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