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arXiv 2107.04650astro-ph.SR
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年轻恒星的绝对参数：PU Pup

Absolute Parameters of Young Stars: PU Pup

A. Erdem, D. Surgit, T. S. Banks, B. Ozkardes, E. Budding

备注：
Accepted by Research in Astronomy and Astrophysics
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摘要：

我们提出了结合光度和光谱分析的南方双星PU Pup。该系统的高分辨率光谱是在坎特伯雷大学拍摄的。约翰天文台在2008年和2014-15年再次。我们发现，在可见光波长范围内，第二组分的光贡献仅为系统总光的$\sim$ 2%，从而产生单线光谱双星.最近的TESS数据揭示了光极小值内的掠食，尽管也从HIPPARCOS数据中检查的潮汐畸变仍然是占主导地位的光变曲线效应。我们的模型显示，PU Pup有更大的主要相对接近填充其罗氏叶。因此，PU Pup正在接近交互式（案例B）进化的罕见“快速阶段”。我们采用的绝对参数如下：$M_1$ = 4.10（$\pm$ 0.20）M $_{\odot}$，$M_2$ = 0.65（$\pm$ 0.05）M $_{\odot}$，$R_{1}$ = 6.60（$\pm$ 0.30）R $_{\odot}$，$R_2$ = 0.90（$\pm$ 0.10）R $_{\odot}$ ; $T_{1}$ = 11500（$\pm$ 500）K，$T_{2}$ = 5000（$\pm$ 350）K;测光距离= 186（$\pm$ 20）pc，年龄= 170（$\pm$ 20）My。与标准的主层序模型相比，质量较小的次级组件被发现明显过大和过亮。我们讨论这种差异是指加热的反射效应。

英文摘要：

We present combined photometric and spectroscopic analyses of the southern binary star PU Pup. High-resolution spectra of this system were taken at the University of Canterbury Mt. John Observatory in the years 2008 and again in 2014-15. We find the light contribution of the secondary component to be only $\sim$2\% of the total light of the system in optical wavelengths, resulting in a single-lined spectroscopic binary. Recent TESS data revealed grazing eclipses within the light minima, though the tidal distortion, examined also from HIPPARCOS data, remains the predominating light curve effect. Our model shows PU Pup to have the more massive primary relatively close to filling its Roche lobe. PU Pup is thus approaching the rare `fast phase' of interactive (Case B) evolution. Our adopted absolute parameters are as follows: $M_1$ = 4.10 ($\pm$0.20) M$_{\odot}$, $M_2$ = 0.65 ($\pm$0.05) M$_{\odot}$, $R_{1}$ = 6.60 ($\pm$0.30) R$_{\odot}$, $R_2$ = 0.90 ($\pm$0.10) R$_{\odot}$; $T_{1}$ = 11500 ($\pm$500) K, $T_{2}$ = 5000 ($\pm$350) K; photometric distance = 186 ($\pm$20) pc, age = 170 ($\pm$20) My. The less-massive secondary component is found to be significantly oversized and overluminous compared to standard Main Sequence models. We discuss this discrepancy referring to heating from the reflection effect.

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