Table 3
Compilation of astrometric measurements for the AB Dor A system.
| Relative positions AB Dor A − AB Dor C | ||||
| Epoch | Instrument | Δα (arcsec) | Δδ (arcsec) | Reference |
|
|
||||
| 2004.093 | VLT/NACO (IR) | −0.125 ± 0.008 | 0.094 ± 0.006 | (1) |
| 2004.825 | ′′ | −0.106 ± 0.005 | 0.191 ± 0.005 | (2) |
| 2004.877 | ′′ | −0.106 ± 0.005 | 0.192 ± 0.005 | (2) |
| 2005.017 | ′′ | −0.089 ± 0.004 | 0.200 ± 0.007 | (3) |
| 2006.066 | ′′ | 0.003 ± 0.003 | 0.202 ± 0.003 | (3) |
|
|
||||
| Absolute positions AB Dor A | ||||
| Epoch | Instrument | RA (h m s) | Dec (° ′ ′′) | |
|
|
||||
| 1990.3888 | Hipparcos | 5 28 44.77474 ± 0.00026 | −65 26 56.24163 ± 0.00074 | (4) |
| 1990.5640 | ′′ | 5 28 44.78652 ± 0.00025 | −65 26 56.22719 ± 0.00068 | (4) |
| 1991.0490 | ′′ | 5 28 44.77578 ± 0.00024 | −65 26 56.26151 ± 0.00075 | (4) |
| 1991.5330 | ′′ | 5 28 44.78942 ± 0.00025 | −65 26 56.07567 ± 0.00083 | (4) |
| 1992.0180 | ′′ | 5 28 44.78202 ± 0.00024 | −65 26 56.11601 ± 0.00088 | (4) |
| 1992.2329 | VLBI | 5 28 44.77687 ± 0.00019 | −65 26 56.00487 ± 0.00070 | (4) |
| 1992.6849 | ′′ | 5 28 44.80124 ± 0.00018 | −65 26 55.93947 ± 0.00063 | (4) |
| 1993.1233 | ′′ | 5 28 44.78492 ± 0.00024 | −65 26 55.91371 ± 0.00084 | (4) |
| 1994.8137 | ′′ | 5 28 44.81768 ± 0.00019 | −65 26 55.68661 ± 0.00047 | (4) |
| 1995.1425 | ′′ | 5 28 44.80247 ± 0.00027 | −65 26 55.62477 ± 0.00114 | (4) |
| 1996.1507 | ′′ | 5 28 44.81137 ± 0.00013 | −65 26 55.48519 ± 0.00032 | (4) |
| 1996.3607 | ′′ | 5 28 44.81776 ± 0.00018 | −65 26 55.37851 ± 0.00104 | (4) |
| 2007.863 | ′′ | 5 28 44.91581 ± 0.00018 | −65 26 53.86529 ± 0.00104 | (5) |
| 2010.816 | ′′ | 5 28 44.94276 ± 0.00018 | −65 26 53.45468 ± 0.00104 | (5) |
| 2013.625 | ′′ | 5 28 44.96397 ± 0.00018 | −65 26 52.99578 ± 0.00104 | (5) |
Notes. The standard deviation of the relative position corresponds to the uncertainty based on the signal-to-noise ratio of the peaks of brightness of AB Dor Ba and Bb. The absolute positions were obtained with reference to the IERS coordinate of the external quasar PKS 0516−621 (α = 5h16m44.s926178,δ = − 62° 7′ 5.′′38930). The standard deviation of the absolute position includes, in addition to the uncertainty of their respective peaks of brightness, the contribution of the propagation media and the reference source structure.
Reference. (1) Close et al. (2005); (2) Nielsen et al. (2005); (3) Close et al. (2007); (4) Guirado et al. (1997); (5) This study.
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