Long-Term Orbital Period Variations for EU Hydrae

Details Long-Term Orbital Period Variations for EU Hydrae Long-Term Orbital Period Variations for EU Hydrae

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..499q&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.2, pp. 499-502

Astronomy and Astrophysics

Astronomy

4

Stars: Activity, Stars: Binaries: Close, Stars: Binaries: Eclipsing, Stars: Individual (Eu Hydrae), Stars: Mass-Loss

Scientific paper

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 d yr-1).By assuming that the alternate variation is cyclic, a period of 26.5yr and an amplitude of 0.0104d 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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