arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.01412astro-ph.SR
收藏

用星团和场中的闪烁双星检验星震标度关系

Testing Asteroseismic Scaling Relations using Eclipsing Binaries in Star Clusters and the Field

K. Brogaard, J. Jessen-Hansen, R. Handberg, T. Arentoft, S. Frandsen, F. Grundahl, H. Bruntt, E. L. Sandquist, A. Miglio, P. G. Beck, A. O. Thygesen, K. L. Kjær… 展开作者

K. Brogaard, J. Jessen-Hansen, R. Handberg, T. Arentoft, S. Frandsen, F. Grundahl, H. Bruntt, E. L. Sandquist, A. Miglio, P. G. Beck, A. O. Thygesen, K. L. Kjærgaard, N. A. Haugaard

摘要:

由星震学确定的恒星质量和半径的准确性是未知的!我们研究这个问题的巨星通过比较经典的测量分离食双星系统(dEBs)与开普勒任务的asteroseismic测量。对于星团,我们外推测量的dEB在关闭区域的红巨星分支和红团,我们调查的巨人作为一个合奏。对于场星,我们测量的dEB振荡的巨人组成部分。通过这些测量,可以将经典食双星分析计算出的质量和半径与小行星地震比例关系和/或其他小行星地震方法计算出的质量和半径进行比较。我们的第一个结果表明,小,但显着的经典和asteroseismic测量之间的系统差异。在这篇文章中,我们展示了我们的最新成果,并总结了目前的状况和未来的计划。我们还强调的重要性,认识到巨恒星质量不能总是翻译的年龄,因为这些未知的部分演变通过一个蓝离散阶段的质量转移在一个二元系统。根据我们在疏散星团NGC 6819和NGC 6791中的发现,我们粗略估计了有多少这样的恒星。

英文摘要:

The accuracy of stellar masses and radii determined from asteroseismology is not known! We examine this issue for giant stars by comparing classical measurements of detached eclipsing binary systems (dEBs) with asteroseismic measurements from the Kepler mission. For star clusters, we extrapolate measurements of dEBs in the turn-off region to the red giant branch and the red clump where we investigate the giants as an ensemble. For the field stars, we measure dEBs with an oscillating giant component. These measurements allow a comparison of masses and radii calculated from a classical eclipsing binary analysis to those calculated from asteroseismic scaling relations and/or other asteroseismic methods. Our first results indicate small but significant systematic differences between the classical and asteroseismic measurements. In this contribution we show our latest results and summarize the current status and future plans. We also stress the importance of realizing that for giant stars mass cannot always be translated to age, since an unknown fraction of these evolved through a blue straggler phase with mass transfer in a binary system. Rough estimates of how many such stars to expect are given based on our findings in the open clusters NGC6819 and NGC6791.

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。

↑