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Table 3
Orbital solutions of θ2 Tau A and B from various techniques.
| Spectroscopic orbital solution (FDBinary) | ||
| Parameter | This work | |
|
|
||
| P (days) | 140.728161 | |
| T | 1993.0751 | |
| e | 0.734662 | |
| ωB (°) | 235.88 | |
| KA (km s-1) | 32.74 | |
| KB (km s-1) | 43.402 (± 0.5, cf. text) | |
|
|
||
| Interferometric Orbital Solution (AM06) | ||
|
|
||
| P (days) | 140.728161 | |
| T | 1989.60701 ± 0.00003 | |
| e | 0.73725 ± 0.00036 | |
| a (mas) | 18.796 ± 0.056 | |
| i (°) | 47.61 ± 0.09 | |
| Ω (°) | 173.73 ± 0.07 | |
| ωA (°) | 55.40 ± 0.06 | |
| πsec (mas) | 22.303 ± 0.36 | |
|
|
||
| Astrometric-Spectroscopic Orbital Solution | ||
| Parameter | This work | TSL97 |
|
|
||
| P (days) | 140.7302 ± 0.0002 | 140.72816 ± 0.00093 |
| T | 1995.00144 ± 0.00002 | 1993.0752 ± 0.0008 |
| e | 0.7360 ± 0.0003 | 0.7266 ± 0.0049 |
| a (mas) | 18.91 ± 0.06 | 18.604 ± 0.20 |
| i (°) | 47.8 ± 0.1 | 46.24 ± 1.0 |
| Ω (°) | 353.82 ± 0.09 | 171.24 ± 1.8 |
| ωB (°) | 235.41 ± 0.08 | 236.4 ± 1.1 |
|
0.754 ± 0.001 | 0.873 ± 0.048 |
| πorb (mas) | 20.90 ± 0.10 | 21.22 ± 0.76 |
| KA (km s-1) | 32.95 ± 0.04 | 33.18 ± 0.49 |
| KB (km s-1) | 43.68 ± 0.14 | 385 ± 2 |
| MA (M⊙) | 2.86 ± 0.03 | 2.42 ± 0.30 |
| MB (M⊙) | 2.16 ± 0.02 | 2.11 ± 0.17 |
| rss (all) | 1.23e+3 | 8.18e+03 |
| System mass (M⊙) | 5.02 ± 0.09 | 4.54 ± 0.51 |
| Time span (yr) | 20.0 | 6.3 |
Notes. The standard deviations including orbital parallax and masses are shown in the bottom panel.
(2)
Fixed (see Sect. 3).
(3)
Adopted from de Bruijne et al. (2001) (not an orbital element).
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