明亮食系三角洲Velorum的干涉测量、光谱学和天体测量学
Interferometry, spectroscopy and astrometry of the bright eclipsing system Delta Velorum
摘要：
明亮的南方恒星三角洲Vel是一个至少由三颗恒星组成的多星系统。它最明亮的组成部分Delta Vel A在2000年被确定为天空中最明亮的日食系统之一。它的日食很容易用肉眼观察到，这是一个只有大陵五，β Aur，Alpha CrB和Psi Cen才拥有的显着特性。我们确定了动力学质量的光谱学相结合，高精度天体测量的轨道的Aab-B和Aa-Ab使用自适应光学（VLT/NACO）和光学干涉测量（VLTI/琥珀）。食的主要组成部分是一对快速旋转的A型星。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）。从这个模型中，我们得到了食星的基本参数，典型的精度为1%。我们发现它们有相似的质量，分别为2.43 +/-0.02和2.27 +/-0.02 Msun。还导出了第三分量的物理参数（Delta Vel B），尽管精度较低，以及系统的视差，39.8 +/-0.4 mas。该值与系统的依巴谷视差（pi_Hip = 40.5 +/-0.4 mas）具有令人满意的一致性（-1.2 σ）。
英文摘要：
The bright southern star Delta Vel is a multiple system comprising at least three stars. Its brightest component, Delta Vel A, was identified in 2000 as one of the brightest eclipsing system in the sky. Its eclipses are easily observable with the unaided eye, a remarkable property shared only by Algol, Beta Aur, Alpha CrB and Psi Cen. We determined dynamical masses from a combination of spectroscopy, high-precision astrometry of the orbits of Aab-B and Aa-Ab using adaptive optics (VLT/NACO) and optical interferometry (VLTI/AMBER). The main eclipsing component is a pair of 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 this modeling, we derive the fundamental parameters of the eclipsing stars with a typical accuracy of 1%. We find that they have similar masses, respectively 2.43 +/- 0.02 and 2.27 +/- 0.02 Msun. The physical parameters of the tertiary component (Delta Vel B) are also derived, although to a lower accuracy, as well as the parallax of the system, 39.8 +/- 0.4 mas. This value is in satisfactory agreement (-1.2 sigma) with the Hipparcos parallax of the system (pi_Hip =40.5 +/- 0.4 mas).
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