Table 1
Differential astrometry of δ Vel derived from the NACO images.
| UT date | MJD | HJD | φ | θ | AM | Δαr | Δδr | [αB − αA] ± σstat | [δB − δA] ± σstat |
| –54 000 | –2 454 000 | ||||||||
|
|
|||||||||
| 2008 Apr. 01 | 557.0224 | 557.5245 | 0.9294 | 0.77 | 1.16 | − 0.014 | 0.113 | − 430.570 ± 0.039 | 457.819 ± 0.043 |
| 2008 Apr. 04 | 560.9976 | 561.4996 | 0.0175 | 0.96 | 1.16 | − 0.028 | 0.098 | − 430.669 ± 0.043 | 457.070 ± 0.055 |
| 2008 Apr. 06 | 562.0121 | 562.5141 | 0.0400 | 0.68 | 1.16 | − 0.010 | 0.115 | − 430.828 ± 0.028 | 457.046 ± 0.037 |
| 2008 Apr. 07 | 563.0048 | 563.5067 | 0.0619 | 0.92 | 1.16 | − 0.015 | 0.111 | − 430.724 ± 0.028 | 456.975 ± 0.038 |
| 2008 Apr. 20 | 576.9715 | 577.4732 | 0.3713 | 0.68 | 1.16 | − 0.009 | 0.113 | − 430.267 ± 0.035 | 452.865 ± 0.039 |
| 2008 Apr. 23 | 579.0231 | 579.5247 | 0.4167 | 1.02 | 1.19 | 0.038 | 0.063 | − 429.964 ± 0.030 | 451.974 ± 0.033 |
| 2008 Apr. 24 | 580.9917 | 581.4932 | 0.4603 | 1.30 | 1.16 | 0.026 | 0.095 | − 429.790 ± 0.042 | 451.090 ± 0.056 |
| 2008 May 05 | 591.9748 | 592.4761 | 0.7036 | 0.79 | 1.17 | 0.035 | 0.079 | − 428.888 ± 0.046 | 448.714 ± 0.042 |
| 2008 May 07 | 593.9732 | 594.4744 | 0.7478 | 0.86 | 1.18 | 0.036 | 0.073 | − 429.234 ± 0.036 | 447.959 ± 0.033 |
| 2008 May 18 | 604.0442 | 604.5450 | 0.9709 | 0.76 | 1.48 | − 0.040 | − 0.013 | − 429.604 ± 0.055 | 445.438 ± 0.051 |
|
|
|||||||||
| 2009 Jan. 07 | 838.1347 | 838.6357 | 0.1556 | 1.20 | 1.41 | − 0.207 | 0.086 | − 424.775 ± 0.084 | 381.374 ± 0.116 |
Notes.φ is the orbital phase of the system (relative to periastron passage), θ the DIMM seeing in arcseconds (in the visible), AM the airmass, and Δαr and Δδr the corrections for the differential atmospheric refraction (see Sect. 2.3 for details). The listed differential astrometry [αB − αA] and [δB − δA] include the atmospheric refraction correction. The angles are all expressed in milliarcseconds.
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