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arXiv 1906.08205astro-ph.SR
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低质量食双星系统NSVS 10653195的绝对尺寸

Absolute dimensions of the low-mass eclipsing binary system NSVS 10653195

Ramon Iglesias-Marzoa, Maria J. Arevalo, Mercedes Lopez-Morales, Guillermo Torres, Carlos Lazaro, Jeffrey L. Coughlin

摘要:

食双星系统中的低质量恒星比理论恒星模型预测的具有相同质量的孤立恒星半径更大,有效温度更低。低质量的双星由于其低光度而很难被发现。因此,对已知的低质量食系统的分析是理解这种行为的关键。我们开发了LMDEB系统NSVS 10653195的物理模型,以精确测量组件的质量和半径。我们获得了几个高分辨率的光谱,以适应光谱轨道。标准化的绝对光度测量获得可靠的颜色指数和测量的平均Teff的系统在出的日食阶段。我们观察并分析了光学VRI和红外JK波段的微分光变曲线,并用PHOEBE进行了拟合。一个马尔可夫链蒙特卡罗(MCMC)模拟附近的解决方案,提供了强大的不确定性拟合参数。NSVS 10653195是一颗由两颗质量相近的恒星组成的食双星,质量分别为M1=0.6402+/-0.0052 Msun和M2=0.6511+/-0.0052 Msun,半径分别为R1=0.687^{+0.017}_{-0.024} Rsun和R2=0.672^{+0.018}_{-0.022} Rsun。光谱类型估计为K6 V和K7 V。这些恒星在一个圆形轨道上旋转,轨道倾角为i=86.22+/-0.61度,周期为P=0.5607222(2)d。到该系统的距离估计为d=135.2^{+7.6}-7.9} pc,与盖亚的值非常一致。根据Mbol-log Teff图,假设太阳金属丰度,系统年龄大于log(age)~8。NSVS 10653195是由两颗超大型K星组成。虽然它们的半径高于模型预测,但它们的Teff与模型更一致。

英文摘要:

Low-mass stars in eclipsing binary systems show radii larger and effective temperatures lower than theoretical stellar models predict for isolated stars with the same masses. Eclipsing binaries with low-mass components are hard to find due to their low luminosity. As a consequence, the analysis of the known low-mass eclipsing systems is key to understand this behavior. We developed a physical model of the LMDEB system NSVS 10653195 to accurately measure the masses and radii of the components. We obtained several high-resolution spectra in order to fit a spectroscopic orbit. Standardized absolute photometry was obtained to measure reliable color indices and to measure the mean Teff of the system in out-of-eclipse phases. We observed and analyzed optical VRI and infrared JK band differential light-curves which were fitted using PHOEBE. A Markov-Chain Monte Carlo (MCMC) simulation near the solution found provides robust uncertainties for the fitted parameters. NSVS 10653195 is a detached eclipsing binary composed of two similar stars with masses of M1=0.6402+/-0.0052 Msun and M2=0.6511+/-0.0052 Msun and radii of R1=0.687^{+0.017}_{-0.024} Rsun and R2=0.672^{+0.018}_{-0.022} Rsun. Spectral types were estimated to be K6V and K7V. These stars rotate in a circular orbit with an orbital inclination of i=86.22+/-0.61 degrees and a period of P=0.5607222(2) d. The distance to the system is estimated to be d=135.2^{+7.6}_{-7.9} pc, in excellent agreement with the value from Gaia. If solar metallicity were assumed, the age of the system would be older than log(age)~8 based on the Mbol-log Teff diagram. NSVS 10653195 is composed of two oversized and active K stars. While their radii is above model predictions their Teff are in better agreement with models.

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