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arXiv 0902.3083astro-ph.SR
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食双星UBVRI Cas的光变曲线和视向速度的绝对参数

Absolute parameters of the eclipsing binary V821 Cas from UBVRI light curves and radial velocities

O. Cakirli, C. Ibanoglu, S. Bilir, E. Sipahi

摘要:

本文介绍了双线食双星V821 Cas的UBVRI测光和分光观测结果。径向速度是通过互相关技术获得的。多波段光变曲线和RV的同时分析给出了恒星的绝对参数:M $_1$ =2.05 $\pm$ 0.07 M $_{\odot}$,M $_2$ =1.63 $\pm$ 0.06 M $_{\odot}$,R $_1$ =2.31 $\pm$ 0.03 R $_{\odot}$,R $_2$ =1.39 $\pm$ 0.02 R $_{\odot}$,T $_{eff_1}$ =9 400 $\pm$ 400 K,T $_{eff_2}$ =8 600 $\pm$ 400 K。对O-C残差的分析表明,双星的拱点运动速率为$\dotω$ =0 $^{\degr}$. 0149 $\pm0^{\degr}$. 0023周期$^{-1}$,对应的拱点周期为U=118 $\pm$ 19年。减去相对论贡献后,得到$\log k_{2obs}$ =-2.590,与理论模型预测值一致。与现有的恒星演化模型比较,给出了该系统的年龄为$5.6\times10^{8}$ yr。

英文摘要:

We present UBVRI photometric measurements and spectroscopic observations of the double-lined eclipsing binary V821 Cas. The radial velocities were obtained by means of the cross-correlation technique. Simultaneous analyses of the multi-band light curves and RVs give the absolute parameters for the stars as: M$_1$=2.05$\pm$0.07 M$_{\odot}$, M$_2$=1.63$\pm$0.06 M$_{\odot}$, R$_1$=2.31$\pm$0.03 R$_{\odot}$, R$_2$=1.39$\pm$0.02 R$_{\odot}$, T$_{eff_1}$=9 400$\pm$400 K, and T$_{eff_2}$=8 600$\pm$400 K. Analysis of the O-C residuals yielded an apsidal motion in the binary at a rate of $\dotω$=0$^{\degr}$.0149$\pm0^{\degr}$.0023 cycle$^{-1}$, corresponding to an apsidal period of U=118$\pm$19 yr. Subtracting the relativistic contribution we find that $\log k_{2obs}$=-2.590 which is in agreement with the value predicted by theoretical models. Comparison with current stellar evolution models gives an age of $5.6\times10^{8}$ yr for the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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