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Table 2.
Orbital and dynamical parameters of MWC 656.
| Used Be line | He I absorption lines( * ) | Hβ | Fe IIλ4583 | HERMES + LT (He II) | |
|---|---|---|---|---|---|
| P [d] | 59.085 ± 0.026 | 59.094 ± 0.024 | 59.090 ± 0.033 | 59.094 ± 0.029 | 59.028 ± 0.011 |
| T0 [BJD-2450000] | 7510.0 ± 8.5 | 7507.53 ± 0.61 | 7507.69 ± 0.84 | 7507.58 ± 0.75 | 7509.20 ± 0.31 |
| e | 0.037 ± 0.035 | 0 (fixed) | 0 (fixed) | 0 (fixed) | 0 (fixed) |
| ω [°] | 105 ± 51 | 90 (fixed) | 90 (fixed) | 90 (fixed) | 90 (fixed) |
| KBe [km s−1] | 11.5 ± 2.8 | 11.5 ± 2.8 | 9.8 ± 2.0 | 11.7 ± 2.6 | 11.6 ± 3.7 |
| KHe II [km s−1] | 92.6 ± 3.1 | 92.9 ± 3.0 | 92.7 ± 4.2 | 92.8 ± 3.7 | 91.2 ± 2.9 |
| q = K1/KHe II | 0.12 ± 0.03 | 0.12 ± 0.03 | 0.11 ± 0.02 | 0.13 ± 0.03 | 0.13 ± 0.05 |
| zoBe [km s−1] | −14.5 ± 2.1 | −14.5 ± 2.1 | −13.7 ± 1.4 | −32.0 ± 1.9 | −14.8 ± 2.8 |
| zoHe II [km s−1] | 85.1 ± 2.3 | 85.2 ± 2.2 | 85.3 ± 3.1 | 85.2 ± 2.7 | 87.2 ± 2.8 |
| ΔRV [km s−1] | / | / | / | / | 30.0 ± 4.1 |
| Reduced χ2 | 10.6 | 10.3 | 19.8 | 15.5 | 18.7 |
Notes. Only the last column includes LT data in the fit. ( * )Lines included in the cross-correlation range: He Iλλ4026, 4121, 4144, 4388, 4471, 4713, 5048.
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