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《New Astronomy》2015
The absolute dimensions of the components of the eccentric eclipsing binary KL CMa have been determined. The solution of light and radial velocity curves of high ( Å) and intermediate ( Å) resolution spectra yielded masses M1 = 3.55 ± 0.27 M⊙, M2 = 2.95 ± 0.24 M⊙ and radii R1 = 2.37 ± 0.09 R⊙, R2 = 1.70 ± 0.1 R⊙ for primary and secondary components, respectively. The system consists of two late B-type components at a distance of 220 ± 20 pc for an estimated reddening of .The present study provides an illustration of spectroscopy’s crucial role in the analysis of binary systems in eccentric orbits. The eccentricity of the orbit () of KL CMa is found to be bigger than the value given in the literature (). The apsidal motion rate of the system has been updated to a new value of , which indicates an apsidal motion period of yrs, two times slower than given in the literature. Using the absolute dimensions of the components yielded a relatively weak relativistic contribution of . The observed internal-structure component () is found to be in agreement with its theoretical value ().Both components of the system are found very close to the zero-age main-sequence and theoretical isochrones indicate a young age ( Myr) for the system. Analysis of the spectral lines yields a faster rotation ( km s−1) for the components than their synchronization velocities ( km s−1, km s−1). 相似文献
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