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Close binaries in near and shallow contact stages

Published online by Cambridge University Press:  25 February 2014

L.Y. Zhu ,
S.B. Qian ,
M. Zejda  and
Z. Mikulášek
L.Y. Zhu
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences (CAS), PO Box 110, 650011 Kunming, China Key laboratory of the structure and evolution of celestial objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
S.B. Qian
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences (CAS), PO Box 110, 650011 Kunming, China Key laboratory of the structure and evolution of celestial objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, PR China
M. Zejda
Affiliation:
Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Z. Mikulášek
Affiliation:
Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
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Abstract

After a detailed investigation of new observations obtained by small telescopes, we found a group of near and shallow contact binaries with decreasing period including BS Vul, MR Com, EP Cep, ES Cep and V369 Cep. BS Vul and V369 Cep are primary-filling near-contact binaries, while MR Com, EP Cep and ES Cep are shallow contact binaries. With their decrease in period, BS Vul and V369 Cep will evolve to the shallow-contact systems with higher mass ratios, just like ES Cep. The period decease of shallow contact binaries could be caused by the combined effect of the thermal relaxation oscillation (TRO) and variable angular momentum loss (AML). This produces contact binaries in oscillating circles that evolve towards the lower mass ratio direction. That means systems resemble ES Cep will evolve to those systems with lower mass ratio, such as MR Com and EP Cep.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 64: Setting a New Standard in the Analysis of Binary Stars , 2013 , pp. 435 - 436
Copyright
© EAS, EDP Sciences, 2014

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References

Qian, S.B., Liu, N.P., Liao, W.P., et al., 2013, AJ, 146, 38CrossRef
Zhu, L.Y., Zejda, M., Mikulášek, Z., et al., 2010, AJ, 140, 215CrossRef
Zhu, L.Y., Qian, S.B., Liu, L., et al., 2013, submitted