| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 12h 52m 24.20s |
| Declination | -29° 14′ 56.0″ |
| Apparent magnitude (V) | 9.6 to 14 (variable) |
| Characteristics | |
| Spectral type | white dwarf + M4/M5: |
| Variable type | DQ Herculis |
| Astrometry | |
| Radial velocity (Rv) | −54[3] km/s |
| Details | |
| Mass | 0.55 ± 0.15[4] M☉ |
| Rotation | 67minutes |
| Mass | 0.085 ± 0.015[4] M☉ |
| Other designations | |
1RXS J125224.7-291451, 2E 2876, RX J1252.4-2914, AAVSO 1247-28 | |
| Database references | |
| SIMBAD | data |
EX Hydrae is a variable star classified as an eclipsing intermediate polar-type cataclysmic variable, specifically of the DQ Herculis type.[3] The system varies in apparent magnitude from 9.6 to 14.[5] The system consists of a white dwarf primary and an M-type secondary, of masses of 0.4–0.7 M☉ and 0.07–0.10 M☉ respectively.[4] The orbital period is 98.25696 minutes (0.068233846 days).[6] The system is 65±11 parsecs distant, making EX Hya one of the closest cataclysmic variable stars.[7] The cataclysmic outbursts appear to be caused by accretion of material from the M-star to the white dwarf.[6]
EX Hydrae also possess a 67-minute oscillation, believed to be caused by the spin period of the white dwarf component.[6] EX Hydrae's outbursts are unpredictable.
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