Astrophysics and Space Science

, Volume 321, Issue 1, pp 19–35 | Cite as

SS Ari: a shallow-contact close binary system

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Abstract

Two CCD epochs of light minimum and a complete R light curve of SS Ari are presented. The light curve obtained in 2007 was analyzed with the 2003 version of the W-D code. It is shown that SS Ari is a shallow contact binary system with a mass ratio q=3.25 and a degree of contact factor f=9.4%(±0.8%). A period investigation based on all available data shows that there may exist two distinct solutions about the assumed third body. One, assuming eccentric orbit of the third body and constant orbital period of the eclipsing pair, results in a massive third body with M 3=1.73M ⊙ and P 3=87.0 yr. On the contrary, assuming continuous period changes of the eclipsing pair the orbital period of tertiary is 37.75 yr and its mass is about 0.278M ⊙. Both of the cases suggest the presence of an unseen third component in the system.

Keywords

Stars: binaries : close Stars: binaries : eclipsing Stars: individuals (SS Ari) Stars: evolution 
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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • L. Liu
    • 1
    • 2
    • 3
  • S.-B. Qian
    • 1
    • 2
    • 3
  • J.-J. He
    • 1
    • 2
    • 3
  • J. Zhang
    • 1
    • 2
    • 3
  • L.-J. Li
    • 1
    • 2
    • 3
  1. 1.National Astronomical Observatories/Yunnan ObservatoryChinese Academy of SciencesKunmingPeople’s Republic of China
  2. 2.United Laboratory of Optical AstronomyChinese Academy of Sciences (ULOAC)BeijingPeople’s Republic of China
  3. 3.Graduate School of the CASBeijingPeople’s Republic of China

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