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arXiv 1805.00520astro-ph.SR
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在选定的双星系统中跟踪自旋轴轨道排列-托伦Rossiter-McLaughlin效应巡天

Tracking the spin axes orbital alignment in selected binary systems - Torun Rossiter-McLaughlin effect survey

P. Sybilski, R. K. Pawłaszek, A. Sybilska, M. Konacki, K. G. Hełminiak, S. K. Kozłowski, M. Ratajczak

摘要:

我们获得了四个食双星系统(FM Leo,NN Del,V963 Cen和AI Phe)的高分辨率光谱,以期深入了解它们的恒星自旋轴和轨道轴的相对取向。Rossiter McLaughlin(RM)效应,即在日食期间光谱的加宽和蓝移或红移的量取决于背景星的自旋轴的倾斜,如果发现这种倾斜,则具有调和观测和理论模型的潜力。我们通过解开光谱,去除前分量和测量剩余分量来分析RM效应,由单值分解(SVD)得到的具有加宽函数(BF)的畸变谱线,由BF在日食中的强度中心加权。除了一个物体外,我们的所有物体都没有显示出明显的错位,这表明对齐的系统占主导地位。我们提供恒星以及轨道参数为我们的系统。有了五个测量的自旋轨道角,我们显着增加(从9到14)的恒星数量,它已被测量。计算出的A1 Phe次级分量的自旋轨道角$β$显示出87 $\pm$ 17度的失准。NN Del具有大的组件分离和长的循环和同步动态时标,是接近原始自旋轨道角测量的一个例子。

英文摘要:

We have obtained high-resolution spectra of four eclipsing binary systems (FM Leo, NN Del, V963 Cen and AI Phe) with the view to gaining insight into the relative orientation of their stellar spin axes and orbital axes. The so called Rossiter-McLaughlin (RM) effect, i.e. the fact that the broadening and the amount of blue- or redshift in the spectra during an eclipse depend on the tilt of the spin axis of the background star, has the potential of reconciling observations and theoretical models if such a tilt is found. We analyse the RM effect by disentangling the spectra, removing the front component and measuring the remaining, distorted lines with a broadening function (BF) obtained from single value decomposition (SVD), weighting by the intensity centre of the BF in the eclipse. All but one of our objects show no significant misalignment, suggesting that aligned systems are dominant. We provide stellar as well as orbital parameters for our systems. With five measured spin-orbit angles we significantly increase (from 9 to 14) the number of stars for which it has been measured. The spin-orbit angle $β$ calculated for AI Phe's secondary component shows a misalignment of 87$\pm$17 degrees. NN Del, with a large separation of components and a long dynamical timescale for circularisation and synchronisation, is an example of a close to primordial spin-orbit angle measurement.

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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