Light-time effect in the eclipsing binary system AM Leonis

Albayrak B., Selam S., Ak T. , Elmasli A., Ozavci I.

ASTRONOMISCHE NACHRICHTEN, vol.326, no.2, pp.122-126, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 326 Issue: 2
  • Publication Date: 2005
  • Doi Number: 10.1002/asna.200410349
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.122-126
  • Istanbul University Affiliated: No


We report four new times of minimum light and the improved ephemeris for the well known contact binary AM Leo. The O-C diagram, constructed with all reliable timings found in the literature was analyzed and the the light-time effect in the system was confirmed. We found a periodicity of 44.82 years in the O-C residuals with an amplitude of 0.0058 day. The periodic curve representing the O-C values is asymmetric indicating a large eccentricity of 0.73 of the third body orbit. The mass of the third body is found to be 0.175 M-circle dot for the orbital inclination of the eclipsing pair's orbit.