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The Light Curve and the Orbital Period Variations of Binary System TT Andromedae
Department of Physics, University of Mohaghegh Ardabili, Ardabil, Iran
Imam Khomeini International University of Qazvin, Qazvin, Iran
Astrophysics Department, Faculty of Physics, University of Tabriz, Tabriz, Iran
Research Institute for Astronomy and Astrophysics of Maragha, Maragha, Iran
- 1 Department of Physics, University of Mohaghegh Ardabili, Ardabil, Iran
- 2 Imam Khomeini International University of Qazvin, Qazvin, Iran
- 3 Astrophysics Department, Faculty of Physics, University of Tabriz, Tabriz, Iran
- 4 Research Institute for Astronomy and Astrophysics of Maragha, Maragha, Iran
International Journal of Astronomy and Astrophysics·Volume 07 (2017)·Pages 112–123·Published 12 April 2017·DOI10.4236/ijaa.2017.72009
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Abstract
The first photoelectric light curve analysis of the TT And system in a broad band filter (400 - 700 nm) was carried out using the PHOEBE program. The absolute dimensions of the system are determined and its evolution is discussed. The most distinct feature of the system is a comparatively very low mass of the cooler component i.e. M 2 = 0.26M⊙. Moreover, using the Observed-minus-Calculated data, the period changes of the system are studied, which reveal the presence of a third body orbiting the system with a period P 3 = 63.89 yr, superimposed on which is a secular period increase, which is ascribed to mass transfer with a rate − 7.60 × 10 − 12 M⊙ yr − 1 from the cooler secondary component.
KeywordsBinaries: EclipsingStars: EvolutionStars: Individual (TT And)
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