Table 4.
Final estimated parameters of the U Aql system.
| Pulsation | ||
|---|---|---|
| Ppuls (days) | 7.02414 ± 0.00004 | |
| T0 (JD)a | 2447755.25 | |
| A1 (km s−1) | −7.47 ± 0.56 | |
| B1 (km s−1) | −12.84 ± 0.35 | |
| A2 (km s−1) | −7.71 ± 0.13 | |
| B2 (km s−1) | −1.36 ± 0.69 | |
| A3 (km s−1) | −1.76 ± 0.35 | |
| B3 (km s−1) | 2.52 ± 0.22 | |
| A4 (km s−1) | −0.29 ± 0.24 | |
| B4 (km s−1) | 1.37 ± 0.06 | |
| A5 (km s−1) | 0.67 ± 0.10 | |
| B5 (km s−1) | 0.47 ± 0.16 | |
| A6 (km s−1) | 0.30 ± 0.03 | |
| B6 (km s−1) | −0.02 ± 0.08 | |
| Orbit | ||
| We87b | This work | |
| Porb (days) | 1856.4 ± 4.3 | 1831.4 ± 6.5 |
| Tp (JD) | 2442754 ± 38 | 2457575.3 ± 8.4 |
| e | 0.165 ± 0.027 | 0.193 ± 0.005 |
| ω (°) | 190.5 ± 7.7 | 167.1 ± 1.9 |
| K1 (km s−1) | 7.81 ± 0.22 | 8.41 ± 0.04 |
| K2 (km s−1)c | – | 24.05 ± 1.24 |
| vγ (km s−1) | 1.15 ± 0.15 | 1.31 ± 0.06 |
| Ω (°) | – | 133.8 ± 4.4 |
| i (°) | – | 115.4 ± 0.7 |
| a (mas) | – | 10.06 ± 0.16 |
| a (au) | – | 5.94 ± 0.22 |
| M1 (M⊙) | – | 6.2 ± 0.8 |
| M2 (M⊙) | – | 2.2 ± 0.2 |
| d (pc)d | – | 592 ± 19 |
Notes. Porb: orbital period. Tp: time passage through periastron. e: eccentricity. K1, K2: RV semi-amplitude of the primary and secondary. vγ: systemic velocity. ω: argument of periastron. Ω: position angle of the ascending node. a: semi-major axis. i: orbital inclination. M1, M2: mass of primary and secondary. Ppuls: pulsation period. T0: reference epoch of maximum light. Ai, Bi: Fourier parameters.
Assumed from the P-L relation of Storm et al. (2011).
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