Table 1.
Physical properties and orbital parameters of AB Dor A/C.
| Parameter | Value | Ref. |
|---|---|---|
| Abs. position AB Dor A (a) | ||
| α0 (h m s) | 5 28 44.79483 | 1 |
| δ0 (° ′ ″) | −65 26 55.91774 | 1 |
| Parallax (mas) | 66.4 ± 0.3 | 1 |
| Distance (pc) | 15.06 ± 0.10 | 1 |
| Orbital elements AB Dor A (b) | ||
| P (years) | 11.78 ± 0.10 | 1 |
| aA (mas) | 31 ± 1 | 1 |
| e | 0.59 ± 0.05 | 1 |
| i (°) | 65 ± 1 | 1 |
| ωA (°) | 114 ± 5 | 1 |
| Ω (°) | 132 ± 2 | 1 |
| T0 | 1991.9 ± 0.2 | 1 |
| Relative position AB Dor C (c) | ||
| Separation (″) | 0.156 ± 0.10 | 2 |
| PA (°) | 127 ± 1 | 2 |
| Stellar properties | ||
| Spectral type A | K0V | 3 |
| Mass A (M⊙) | 0.89 ± 0.08 | 1 |
| Radius A (R⊙) | 0.96 ± 0.06 | 5 |
| Rot. period A (days) | 0.51479 ± 0.00001 | 4 |
| Spectral type C | M8 | 2 |
| Mass C (M⊙) | 0.090 ± 0.008 | 1 |
Notes.
We consider the pair AB Dor A and AB Dor C with the origin of coordinates placed at the center of mass of this system. P, aA, e, i, ωA, Ω, and T0 represent the period of the orbit, the semi-major axis of AB Dor A apparent orbit in the sky, the ellipticity of the orbit, the inclination of the orbit on the sky, the longitude of the periastron of the orbit, the longitude of the ascending node, and the time of periastron passage, respectively.
References. (1) Azulay et al. (2017); (2) Close et al. (2005); (3) Torres et al. (2006); (4) Innis et al. (1988); (5) Guirado et al. (2011).
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