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Table 2.
System parameters of EX Hya.
| Parameter | Value |
|---|---|
| Distance d (pc) | 56.77 ± 0.05 (a) |
| Orbital period Porb (s) | 5895.4 |
| Spin period Pspin (s) | 4021.6 |
| Velocity amplitude of WD K1 (km s−1) | 58.9 ± 1.8 (b) |
| Velocity amplitude of secondary K2 (km s−1) | 432.4 ± 4.8 (c) |
| Mass ratio q = M2/M1 | 0.1362 ± 0.0044 |
| Duration of X-ray eclipse tecl (s) | 157 ± 4 (d) |
| Inclination i (°) | 78.0 ± 0.2 |
| Minimal inclination i0 for WD center (°) | 78.1 ± 0.1 |
| Total mass M = M1 + M2 (M⊙) | 0.895 ± 0.028 |
| Mass of WD M1 (M⊙) | 0.788 ± 0.025 |
| Radius of WD R1 (108 cm) | 7.35 ± 0.23 (c) |
| Mass of secondary M2 (M⊙) | 0.1074 ± 0.0047 |
| Radius of secondary R2 (R⊙) | 0.1513 ± 0.0022 |
| Separation of stars a (1010 cm) | 4.712 ± 0.050 |
| Spin-up timescale τspin of WD (106 yr) | 5.28 ± 0.10 |
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