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arXiv 0902.3327astro-ph.SR
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一个新的小质量食双星:NSVS 02502726

A new low-mass eclipsing binary: NSVS 02502726

O. Cakirli, C. Ibanoglu, C. Gungor

摘要:

本文介绍了双线食双星NSVS 02502726(2 MASS J08441103+5423473)的光谱学和广泛的$RI$差示光度学。同时解决两个波段的光变曲线和径向速度允许确定精确的经验质量和半径的两个组件的系统。分析表明,NSVS 02502726的主、次分量都在一个轨道周期为0.56天的圆形轨道上,恒星质量分别为M $_1$ =0.714 $\pm$ 0.019 \Msun和M $_2$ =0.347 $\pm$ 0.012 \Msun。两个分量都具有大半径,R $_1$ =0.67 $\pm$ 0.01 PDMATHAMR,R $_2$ =0.76 $\pm$ 0.01 \Rsun。主参数的质量和半径的组成恒星的精度分别为3%和1%。第二部分的半径明显大于模型预测的质量,类似于几乎所有其他研究充分的低质量恒星,属于双线食双星。强H $_α$发射核心以及$R$和$I$带通中食外光曲线的相当大的失真(可能是由于两颗恒星上的黑点造成的)已被视为恒星活动强烈的证据。根据$BVRIJHK$星等,计算到系统的距离为173 $\pm$ 8 pc。各分量的绝对参数表明,这两个分量都接近于零龄主层序。与目前的恒星演化模型比较,得出的年龄为126 $\pm$ 30百万年,表明恒星处于主序前收缩的最后阶段。

英文摘要:

We present optical spectroscopy and extensive $RI$ differential photometry of the double-lined eclipsing binary NSVS 02502726 (2MASS J08441103+5423473). Simultaneous solution of two-band light curves and radial velocities permits determination of precise emprical masses and radii for both components of the system. The analysis indicates that the primary and secondary components of NSVS 02502726 are in a circular orbit with 0.56-day orbital period and have stellar masses of M$_1$=0.714$\pm$0.019 \Msun, and M$_2$=0.347$\pm$0.012 \Msun. Both of the components have large radii, being R$_1$=0.67$\pm$0.01 \Rsun, and R$_2$=0.76$\pm$0.01 \Rsun. The principal parameters of the mass and radius of the component stars are found with an accuracy of 3% and 1%, respectively. The secondary component's radius is significantly larger than model predictions for its mass, similar to what is seen in almost all of the other well-studied low-mass stars which belong to double-lined eclipsing binaries. Strong H$_α$ emission cores and considerable distortion at out-of-eclipse light curve in both $R$ and $I$ bandpasses, presumably due to dark spots on both stars, have been taken as an evidence of strong stellar activity. The distance to system was calculated as 173$\pm$8 pc from the $BVRIJHK$ magnitudes. The absolute parameters of the components indicate that both components are close to the zero-age main-sequence. Comparison with current stellar evolution models gives an age of 126 $\pm$30 Myr, indicating the stars are in the final stages of pre-main-sequence contraction.

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