arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.07489astro-ph.SR
收藏

V356 Sgr星周和周双星的复杂环境

The Complex Circumstellar and Circumbinary Environment of V356 Sgr

Jamie R. Lomax, Andrew G. Fullard, Michael A. Malatesta, Brian Babler, Daniel Bednarski, Jodi R. Berdis, Karen S. Bjorkman, Jon E. Bjorkman, Alex C. Carciofi, J… 展开作者

Jamie R. Lomax, Andrew G. Fullard, Michael A. Malatesta, Brian Babler, Daniel Bednarski, Jodi R. Berdis, Karen S. Bjorkman, Jon E. Bjorkman, Alex C. Carciofi, James W. Davidson, Marcus Keil, Marilyn R. Meade, Kenneth Nordsieck, Matt Scheffler, Jennifer L. Hoffman, John P. Wisniewski

摘要:

我们分析了45分光偏振观测的食,相互作用的双星V356 Sgr,在21年的时间内获得的,系统的拱星材料的几何特征。从这些数据中删除星际极化后,我们发现该系统表现出一个大的固有的电子散射所产生的极化签名。此外,极化相位曲线中缺乏可重复的日食表明存在大量未被任何一颗恒星掩盖的散射体。我们认为,这些散射体形成一个circumbinary磁盘共面的盖纳的吸积盘或拉长的结构垂直于轨道平面的V356 Sgr,可能形成的双极流出。我们还观察到小规模的,周期到周期的变化在各个阶段的内在偏振的幅度,我们解释为系统内和周围存在的散射材料的量的变化的证据。这可能表明质量转移或质量损失率在系统轨道周期的时间尺度上变化。最后,我们比较了V356 Sgr和已经研究得很好的beta Lyr系统的基本偏振特性;在两个系统之间观察到的显著差异表明Roche瓣溢出系统的基本拱星几何结构的多样性

英文摘要:

We analyze 45 spectropolarimetric observations of the eclipsing, interacting binary star V356 Sgr, obtained over a period of 21 years, to characterize the geometry of the system's circumstellar material. After removing interstellar polarization from these data, we find the system exhibits a large intrinsic polarization signature arising from electron scattering. In addition, the lack of repeatable eclipses in the polarization phase curves indicates the presence of a substantial pool of scatterers not occulted by either star. We suggest that these scatterers form either a circumbinary disk coplanar with the gainer's accretion disk or an elongated structure perpendicular to the orbital plane of V356 Sgr, possibly formed by bipolar outflows. We also observe small-scale, cycle-to-cycle variations in the magnitude of intrinsic polarization at individual phases, which we interpret as evidence of variability in the amount of scattering material present within and around the system. This may indicate a mass transfer or mass loss rate that varies on the time-scale of the system's orbital period. Finally, we compare the basic polarimetric properties of V356 Sgr with those of the well studied beta Lyr system; the significant differences observed between the two systems suggests diversity in the basic circumstellar geometry of Roche-lobe overflow systems

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。

↑