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arXiv 2012.11940astro-ph.SRastro-ph.IM
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利用地面和空间多波段高时间分辨率测光研究SZ Lyn的星震

Asteroseismology of sz lyn using multi-band high time resolution photometry from ground and space

J. Adassuriya, S. Ganesh, J. L. Gutierrez, G. Handler, Santosh Joshi, K. P. S. C. Jayaratne, K. S. Baliyan

摘要:

我们报告的分析高时间分辨率的地面和空间的光度观测SZ Lyncis,双星的组成部分之一是高振幅$δ$盾牌座。UBVR光度观测从Mt.阿布红外线天文台和费尔伯恩天文台;来自WASP项目的档案观测也包括在内。此外,TESS项目的连续高质量光变曲线被广泛用于分析。TESS的光变曲线显示了23个频率,其中有4个独立的模式,主脉动频率为8.296943 $\pm$ 0.000002 d $^{-1}$的13个谐波及其组合。利用振幅比法和估算的脉动常数确定了频率为8.296 d的$^{-1}$为径向基模。其中14.535 d $^{-1}$、32.620 d $^{-1}$和4.584 d $^{-1}$是Lyn的新发现。其中14.535 d的$^{-1}$和32.620 d的$^{-1}$被认为是非径向低阶p模,4.584 d的$^{-1}$可能是$δ$ Scuti星中g模的指示。作为频率测定和模式识别的结果,利用观测频率对恒星脉动模型进行了优化,修正了SZ Lyn的物理参数。理论模型对应于7500 K $\le $ T $_{\rm eff}$ $\le$ 7800 K,log(g)=3.81 $\pm$ 0.06。利用进化序列估计SZ Lyn的质量接近1.7- 2.0 M $_\odot$。周期-密度关系估计平均密度$ρ$为0.1054 $\pm$ 0.0016 g cm $^{-3}$

英文摘要:

We report the analysis of high temporal resolution ground and space based photometric observations of SZ Lyncis, a binary star one of whose components is a high amplitude $δ$ Scuti. UBVR photometric observations were obtained from Mt. Abu Infrared Observatory and Fairborn Observatory; archival observations from the WASP project were also included. Furthermore, the continuous, high quality light curve from the TESS project was extensively used for the analysis. The well resolved light curve from TESS reveals the presence of 23 frequencies with four independent modes, 13 harmonics of the main pulsation frequency of 8.296943$\pm$0.000002 d$^{-1}$ and their combinations. The frequency 8.296 d$^{-1}$ is identified as the fundamental radial mode by amplitude ratio method and using the estimated pulsation constant. The frequencies 14.535 d$^{-1}$, 32.620 d$^{-1}$ and 4.584 d$^{-1}$ are newly discovered for SZ Lyn. Out of these three, 14.535 d$^{-1}$ and 32.620 d$^{-1}$ are identified as non-radial lower order p-modes and 4.584 d$^{-1}$ could be an indication of a g-mode in a $δ$ Scuti star. As a result of frequency determination and mode identification, the physical parameters of SZ Lyn were revised by optimizations of stellar pulsation models with the observed frequencies. The theoretical models correspond to 7500 K $\le $T$_{\rm eff}$ $\le$ 7800 K, log(g)=3.81$\pm$0.06. The mass of SZ Lyn was estimated to be close to 1.7--2.0 M$_\odot$ using evolutionary sequences. The period-density relation estimates a mean density $ρ$ of 0.1054$\pm$0.0016 g cm$^{-3}$

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