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arXiv 2103.10109astro-ph.SR
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深低质量比接触双星CSS J022914 .4+044340及其发光伴星

The Deep and Low-Mass-Ratio Contact Binary CSS J022914.4+044340 with A Luminous Additional Companion

Liang Liu, Xu-Zhi Li

摘要:

给出并分析了CSS J022914.4+044340的第一个B-、V-、Rc-和Ic-带光变曲线。研究发现,CSS J022914.4+044340是一个低质量比(0.198 ± 0.005)的深部(63.7 ± 7.9%)接触双星,表明它已经处于磁风潮汐锁定演化的末期。由于日全食的性质,测光解是可靠的。由光谱数据确定的温度和金属量分别为T = 5855 ± 15 K和[Fe/H] = -0.842 ± 0.031。基于Gaia EDR 3的视差,估计CSS J022914.4+044340的物理参数为M1 = 1.44(+0.25,-0.22)太阳质量,M2 = 0.29(+0.05,-0.05)太阳质量,R1 = 1.26(+0.08,-0.06)太阳半径,R2 = 0.65(+0.03,-0.04)太阳半径,L1 = 1.718(+0.186,-0.191)太阳光度,L2 = 0.416(+0.039,-0.050)太阳光度。结合光度计解中第三个天体的光度(54%),第三个天体的光度估计为2.705太阳光度。第三个天体可能被推断为亚巨星。从而解释了CSS J022914.4+044340的主要组分在同类体系中质量较高,金属丰度较低的原因。

英文摘要:

The first B-, V-, Rc-, and Ic-band light curves of CSS J022914.4+044340 are presented and analyzed. It is found that CSS J022914.4+044340 is a low mass ratio (0.198 +- 0.005) deep (63.7 +- 7.9%) contact binary, indicating that it has been already at the end evolutionary stage of tidally-locked evolution via magnetized wind. Because of the totally eclipsing character, the photometric solutions are reliable. The temperature and the metallicity are determined from the spectroscopic data as T = 5855 +- 15 K, and [Fe/H] = -0.842 +- 0.031, respectively. Based on the parallax of Gaia EDR3, the physical parameters of CSS J022914.4+044340 are estimated as M1 = 1.44 (+0.25,-0.22) solar mass, M2 = 0.29 (+0.05,-0.05) solar mass, R1 = 1.26 (+0.08,-0.06) solar radius, R2 = 0.65 (+0.03,-0.04) solar radius, L1 = 1.718 (+0.186,-0.191) solar luminosity, L2 = 0.416 (+0.039,-0.050) solar luminosity. Combined the fraction in light of the third body via the photometric solution (54%), the luminosity of the third body is estimated as 2.705 solar luminosity. The third body may be inferred as a subgiant. Thus, it is explained that why the primary component of CSS J022914.4+044340 has higher mass among the similar systems, and why its metallicity is so poor.

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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