Photometric Light Curve Analysis of ET Leo

  • Aven M. Hamedamen Department of Physics, College of Education, Salahaddin University-Erbil, Kurdistan Region, Iraq.
  • Ismail M. Murad Department of Physics, College of Education, Salahaddin University-Erbil, Kurdistan Region, Iraq.
Keywords: Light curve ,Photometric,Binary star,Spot activity


   In this work, the short period system named (ET Leo) have been chosen to be analyzed with  B , V and R light curves with the Wilson-Devinney code and the results of orbital parameters of the system were obtained and compared with those obtained from previous studies. The present results indicated that the selected system is a contact system and the absolute parameters of the components have been determined with suitable accuracy, for which the physical parameters have been obtained in a uniform way. Spot solution parameters have been evaluated for the binary system under investigation. The system shows asymmetries and peculiarities in the observed light curves.


[1]ESA , The Hipparcos and Tycho Catalogues, ESA SP-1200,(1997).
[2]Gomez-Forrellad, J.M., Garcia-Melendo, E., Guarro-Flo, J., Nomen-Torres, J., and Vidal-Sainz, J. IBVS, 4702,(1999).
[3]Kazarovets, E. V., Samus, N. N., DurlewichO. V., et al. IBVS, No.4659,(1999).
[4]Duerbeck, H. W. IBVS, No. 4513,(1997).
[5]Rucinski, S. M., Lu, S. M., Capobianco, C. C., et al. , AJ, 124, 1738,(2002).
[6]Tanriverdi, T., Senavci, H.V., Selam, S.O., and Albayrak, B. ASP Conf. Ser., 318, 189,(2004).
[7]Straizys, V., &Kuriliene, G. Ap&SS, 80, 253,(1981).
[8]Van Hamme, W. AJ, 106, 2096, (1993).
[9] Cséki, A. "The analysis of SuperWASP photometric data for the overcontact binary QW Gem." Serbian Astrono.J. Vol. (186): P.47-51, (2013)
[10] Selam, S.O., “Key Parameters of W UMa-Type Contact Binaries
Discovered by HIPPARCOS” . Astron.Astrophys.,Vol.416, P.1097, (2004).
[11] Brancewicz. H. KDworak. , T. Z, "A Catalogue of Parameters for Eclipsing Binaries", Acta Astrono., No.4, Vo1.30, P.506- 520, (1980).
[12] Al-Naimiy H.M.K., “Star- Spot Studies for Three Short Period RS CVn-Type Binaries”. Astrophy. Vol.44, No(2), P.233,(2001).
[13] K.D.Gazeas1, P.G.Niarchos1 ,S. Zola2,3, J.M. Kreiner3 , S.M. Rucinski4 , Acta Astron. Vol.56,P( 127-143) (Paper IV),(2006).
[14] Kopal Z., and Shaply M.B.,Jodrell Bank Ann. Vol.30, P1.141,(1956).
[15] Allen C.W., “Astrophysical Quantities”.,3rd Ed. The Athlon Press, London,(1976).
[16] Barrado. D, Fernandez-Figueroa. M. J, Montesinos. B, de Castro. E, "The Age-Mass Relation for Chromospherically Active Binaries. L The Evolutionary Status ",Astron. Astrophys.,Vol.290, PP:143,(1994).
[17]- Kopal Z., “Language of the Stars”. D. Reidel Publishing Company, Dordrecht, London, (1979).
[18]- Binnendijk, L. "The Light Variation and Orbital Elements of W Ursae Majoris." The Astrono. J., Vol.71, PP. 340-349, (1966).
[19]- Mochnackiand N S.W. Doughty. A.,“Models for five Wursae majoris systems,” Monthly Notices of the Royal Astronomical Society,vol.156,no.2,pp.243–252,1972.
How to Cite
M. Hamedamen, A., and I. M. Murad. “Photometric Light Curve Analysis of ET Leo”. ZANCO Journal of Pure and Applied Sciences, Vol. 31, no. s4, Oct. 2019, pp. 1-6, doi:10.21271/zjpas.31.s4.1.