Long-term orbital period variations for EU hydrae
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 per...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
2014
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| Online Access: | http://www.scopus.com/inward/record.url?eid=2-s2.0-30244467434&partnerID=40&md5=c31a187bb2c8192c853acb1624367985 http://cmuir.cmu.ac.th/handle/6653943832/6009 |
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| Institution: | Chiang Mai University |
| Language: | English |
| Summary: | 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 × 10-8 dyr-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. |
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