Spin-up and accretion in EX Hydrae during its quiescent state
Open Access
- 1 June 1988
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 232 (4) , 753-762
- https://doi.org/10.1093/mnras/232.4.753
Abstract
The cataclysmic variable EX Hydrae was monitored photoelectrically during its quiescent state during 1986. New timing data obtained from measurements of the 67-min cycle indicate that its period continues to decrease secularly. Interpreting this in the context of the intermediate polar model yields a probable mass accretion rate in the range $${10}^{-11}{-10}^{-10}{M}_{\odot}\,\text{yr}^{-1}$$. The orbital period has decreased over the interval 1981–86 but the long-term trend is consistent with a sinusoidal variation noted in earlier studies. This trend most probably reflects complex angular momentum transfer mechanisms in addition to gravitational radiation and spin-orbit coupling.
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