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Sheng-Bang Qian, Soonthornthum Boonrucksar, Long-Term Orbital Period Variations for EU Hydrae, Publications of the Astronomical Society of Japan, Volume 55, Issue 2, 25 April 2003, Pages 499–502, https://doi.org/10.1093/pasj/55.2.499
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Abstract
Long-term period variations of an Algol-type eclipsing binary star, EU Hydrae, are presented based on an analysis of its |$O-C$| curve. As in the cases of other Algols studied in recent papers by one of the authors (S.-B. Qian), an alternate period change has discovered to superimpose on a secular period decrease (|$dP / dt =-4.8 \times 10^{-8} \,\mathrm{d} \,\mathrm{yr}^{-1}$|). By assuming that the alternate variation is cyclic, a period of 26.5 yr and an amplitude of 0.0104 d were determined. A long-term period decrease combined with a semi-detached configuration may indicate that EU Hya is undergoing a secular angular momentum loss. Three possible mechanisms are proposed to explain the alternate period change.