Table 4
Physical and orbital parameters of the DE0823−49 system.
| 2MASS entry | J08230313–4912012 | ||
| mI (primary) | (mag) | 17.1 | |
|
(mas) | –137.65 |
|
| Δδ0 | (mas) | –30.72 |
|
| ϖ | (mas) | 48.09 ± 0.18 | |
| μ α ⋆ | (mas yr-1) | –154.30 ± 0.12 | |
| μ δ | (mas yr-1) | 7.46 ± 0.09 | |
| e | ··· | 0.345 |
|
| ω | (deg) | 36.3 |
|
| P | (day) | 246.36 |
|
| λ 0 | (deg) | 201.0 |
|
| Ω | (deg) | –15.6 |
|
| i | (deg) | 56.6 |
|
| a1 (barycentre) | (mas) | 4.61 |
|
|
(MJ) | 2.02 |
|
| ρ | (mas) | +20.5 |
|
| d | (mas) | –24.5 |
|
| sα,sδ | (mas) | 0.16 ± 0.07/0.12 ± 0.05 | |
| Reference date | (MJD) | 55 821.933543 | |
| Derived and additional parameters | |||
| Δϖ | (mas) | +0.062 ± 0.038 | |
| ϖ abs | (mas) | 48.16 |
|
| Distance | (pc) | 20.77 ± 0.08 | |
| Age | (Gyr) | 1 | 0.6–3 |
| M 1 | (MJ) | 78.4 ± 7.8 | 70.2–82.8 |
| M 2 | (MJ) | 28.5 ± 1.9 | 26.7–29.4 |
| q = M2/M1 | ··· | 0.364 |
0.355–0.380 |
(relative orbit) |
(AU) | 0.36 ± 0.01 | 0.348–0.365 |
| Number of epochs/frames | 14/281 | ||
| σO − C (RA/Dec) | (mas) | 1.05/0.82 | |
| σ O − C,Epoch | (mas) | 0.330 | |
| σO − C,Epoch (RA) | (mas) | 0.410 | |
| σO − C,Epoch (Dec) | (mas) | 0.221 | |
Notes. Parameter values correspond to the median of the marginal
parameter distributions and uncertainties represent 1σ ranges. The
proper motions are not absolute and were measured relative to the local reference
frame. The modified Julian date (MJD) equals barycentric Julian date – 2 400 000.5.
The semimajor axis of the relative orbit
is given in AU. The inclination is with respect to the plane of the sky. There is an
ambiguity of 180° in inclination and longitude of ascending node that is inherent to
astrometric orbits but does not influence the system’s properties. Parameters that
depend on the age of the system are given with formal uncertainties for an age of 1
Gyr and with value ranges for ages of 0.6–3 Gyr.
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