Table 4
Estimates of the astrometric and orbital parameters of AB Dor B.
| Parameter | Value |
|
|
|
| α0 (h m s): | 5 28 44.48396 ± 0.00022 |
| δ0 (°′′′): | −65 26 46.0573 ± 0.0013 |
| μα (s yr-1): | 0.01054 ± 0.00012 |
| μδ (arcsec yr-1): | 0.1287 ± 0.0005 |
| Qα (s yr-2): | 0.000008 ± 0.000001 |
| Qδ (arcsec yr-2): | −0.00010 ± 0.00005 |
| π (arcsec)a: | 0.0664 ± 0.0005 |
| P (yr): | 0.986 ± 0.008 |
| arel (′′): | 0.052 ± 0.002 |
| aBa (′′): | 0.028 ± 0.002 |
| aBb (′′): | 0.025 ± 0.002 |
| e: | 0.6 ± 0.1 |
| i (°): | 121 ± 5 |
| ωBb (°)b: | 54 ± 20 |
| Ω (°): | 270 ± 15 |
| T0: | 2003.68 ± 0.05 |
| mBa (M⊙): | 0.28 ± 0.05 |
| mBb (M⊙): | 0.25 ± 0.05 |
Notes. The reference epoch is 2000.0. The number of degrees of freedom of the fit is 14; the minimum value found for the reduced χ2 is 1.2. aWe note that our parallax estimate is more accurate than the Hipparcos value given for AB Dor A and still compatible. bFor the absolute orbit of AB Dor Ba ωBa = ωBb + π.
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