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Table 1
Best-fit orbital parameters of HD 152218.
| Parameter | Stickland et al. (1997) | Sana et al. (2008a) | This work | ||
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| New FEROS RVs | All RV data | Echelle spectra | |||
| [ 1] | [ 2] | [ 3] | [ 4] | [ 5] | |
|
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| Porb (d) | 5.603979 | 5.60391 | 5.60400 ± 0.00004 |
|
|
| e | 0.308 ± 0.018 | 0.259 ± 0.006 | 0.269 ± 0.005 |
|
|
| ω (°) | 80.6 ± 2.1 | 104.0 ± 1.6 | 103.4 ± 0.9 | ||
 (° yr-1) |
1.4 – 3.2 |
|
|
||
| ω0 (°) |
|
|
|||
| T0 (HJD−2 400 000) | 48 865.024 ± 0.028 | 53 197.229 ± 0.025 | 53 129.986 ± 0.015 |
|
|
| q = m1/m2 | 1.341 ± 0.030 | 1.319 ± 0.014 | 1.320 ± 0.011 | ||
| K1 (km s-1) | 156.9 ± 3.6 | 162.2 ± 1.2 | 160.3 ± 1.0 | ||
| K2 (km s-1) | 210.4 ± 3.5 | 213.9 ± 1.5 | 211.5 ± 1.3 | ||
| γ1 (km s-1) | −26.6 ± 1.9 | 0.9 ± 1.2 | −18.6 ± 0.8 | ||
| γ2 (km s-1) | = γ 1 | −0.6 ± 1.4 | −19.3 ± 0.9 | ||
| a1 sini (R⊙) | 16.53 ± 0.39 | 17.34 ± 0.13 | 17.1 ± 0.1 | ||
| a2 sini (R⊙) | 22.17 ± 0.39 | 22.87 ± 0.17 | 22.6 ± 0.1 | ||
| m1 sin3i (M⊙) | 14.22 ± 0.64 | 15.82 ± 0.26 | 15.2 ± 0.2 | ||
| m2 sin3i (M⊙) | 10.60 ± 0.53 | 12.00 ± 0.19 | 11.5 ± 0.2 | ||
Notes. Columns 1 and 2 list the orbital solutions from the literature for comparison with our results. The last two columns yield the best-fit parameters accounting for apsidal motion for the full set of 81 RV measurements of the primary star and for the 61 échelle spectra only.
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