• Y.-G. Jiang

      Articles written in Journal of Astrophysics and Astronomy

    • Photometric Analysis and Period Investigation of the EW Type Eclipsing Binary V441 Lac

      K. Li S.-M. Hu D.-F. Guo Y.-G. Jiang D.-Y. Gao X. Chen

      More Details Abstract Fulltext PDF

      Four color light curves of the EW type eclipsing binary V441Lac were presented and analyzed by the W--D code. It is found that V441Lac is an extremely low mass ratio $(q = 0.093 \pm 0.001)$ semi-detached binary with the less massive secondary component filling the inner Roche lobe. Two dark spots on the primary component were introduced to explain the asymmetric light curves. By analyzing all times of light minimum, we determined that the orbital period of V441 Lac is continuously increasing at a rate of ${\rm d}P/{\rm d}t = 5.874(\pm 0.007)\times 10^{--7} {\rm d yr}^{--1}$. The semidetached Algol type configuration of V441 Lac is possibly formed by a contact configuration destroyed shallow contact binary due to mass transfer from the less massive component to the more massive one predicted by the thermal relaxation oscillation theory.

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