arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1106.2383astro-ph.SR
收藏

附近的食恒星系统三角洲Velorum III。自洽的基本参数和距离

The nearby eclipsing stellar system delta Velorum III. Self-consistent fundamental parameters and distance

A. Merand, P. Kervella, T. Pribulla, M. G. Petr-Gotzens, M. Benisty, A. Natta, G. Duvert, D. Schertl, M. Vannier

摘要:

三角洲Vel(由两颗A型主序星和一颗F型主序星组成)是特别有趣的,因为它包含最近和最明亮的食双星之一。因此,它提供了一个独特的机会,以独立地确定系统的三个组成部分的物理特性,以及它的距离。我们的目标是确定的基本参数(质量,半径,光度,旋转速度)的三个组件的delta Vel,以及视差的系统,独立于现有的依巴谷测量。我们使用自适应光学(VLT/NACO)和光学干涉测量(VLTI/AMBER)对Aab-B和Aa-Ab轨道进行了高精度天体测量,确定了动力学质量。它的主要组成部分是一个食双星,由两颗快速自转的早期A型恒星组成。我们模拟的光度和径向速度测量的食对Aa-Ab使用自洽的方法的基础上的物理参数(质量,半径,光度,旋转速度)。从我们的自洽建模的主要和次要组成部分的三角洲Vel A食对,我们得到了他们的基本参数的典型精度为1%。我们发现它们有相似的质量,分别为2.43+/-0.02Msol和2.27+/-0.02Msol。第三分量的物理参数(Δ Vel B)也估计,但精度较低。我们获得了系统的视差为39.8+/-0.4mas,与依巴谷值(40.5+/-0.4mas)具有令人满意的一致性(-1.2 sigma)。我们得到的物理参数代表了一组一致的约束条件,这个系统的进化建模。我们测量的视差与依巴谷值的一致性达到了1%的精度,这也是对这两个独立测量的真实精度的有趣确认。

英文摘要:

The triple stellar system delta Vel (composed of two A-type and one F-type main sequence stars) is particularly interesting as it contains one of the nearest and brightest eclipsing binaries. It therefore presents a unique opportunity to determine independently the physical properties of the three components of the system, as well as its distance. We aim at determining the fundamental parameters (masses, radii, luminosities, rotational velocities) of the three components of delta Vel, as well as the parallax of the system, independently from the existing Hipparcos} measurement. We determined dynamical masses from high-precision astrometry of the orbits of Aab-B and Aa-Ab using adaptive optics (VLT/NACO) and optical interferometry (VLTI/AMBER). The main component is an eclipsing binary composed of two early A-type stars in rapid rotation. We modeled the photometric and radial velocity measurements of the eclipsing pair Aa-Ab using a self consistent method based on physical parameters (mass, radius, luminosity, rotational velocity). From our self-consistent modeling of the primary and secondary components of the delta Vel A eclipsing pair, we derive their fundamental parameters with a typical accuracy of 1%. We find that they have similar masses, respectively 2.43+/-0.02Msol and 2.27+/-0.02Msol. The physical parameters of the tertiary component (delta Vel B) are also estimated, although to a lower accuracy. We obtain a parallax of 39.8+/-0.4mas for the system, in satisfactory agreement (-1.2 sigma) with the Hipparcos value (40.5+/-0.4mas). The physical parameters we derive represent a consistent set of constraints for the evolutionary modeling of this system. The agreement of the parallax we measure with the Hipparcos value to a 1% accuracy is also an interesting confirmation of the true accuracy of these two independent measurements.

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。

↑