The Eclipsing LMC Star and Double Period Variable OGLE 05155332-6925581 in an Interesting Evolutionary Stage
Abstract
We analyze multicolor light curves and high resolution optical spectroscopy of the eclipsing binary and Double Periodic Variable OGLE 05155332-6925581. This system shows a significant change in the long non-orbital photometric cycle, a loop in the color-magnitude diagram during this cycle and discrete spectral absorption components that were interpreted as evidence of systemic mass loss. A comparison with synthetic binary-star evolutionary models indicates that the system has an age of 4.76 × 10^{7} years, is in the phase of rapid mass transfer, the second one in the life of this binary, in a Case-B mass-exchange stage. Furthermore, our observations suggest that the DPV phenomenon could have an important effect in the balance of mass and angular momentum in the system.
- Publication:
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Central European Astrophysical Bulletin
- Pub Date:
- 2013
- Bibcode:
- 2013CEAB...37..355G
- Keywords:
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- early-type stars;
- evolution;
- mass-loss;
- eclipsing binaries