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arXiv 1111.1266astro-ph.SR
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原型碰撞风双星WR 140的第一个可见轨道

First visual orbit for the prototypical colliding-wind binary WR 140

J. D. Monnier, Ming Zhao, E. Pedretti, R. Millan-Gabet, J. P. Berger, W. Traub, F. P. Schloerb, T. ten Brummelaar, H. McAlister, S. Ridgway, L. Sturmann, J. Stu… 展开作者

J. D. Monnier, Ming Zhao, E. Pedretti, R. Millan-Gabet, J. P. Berger, W. Traub, F. P. Schloerb, T. ten Brummelaar, H. McAlister, S. Ridgway, L. Sturmann, J. Sturmann, N. Turner, F. Baron, S. Kraus, A. Tannirkulam, P. M. Williams

摘要:

沃尔夫-拉叶星代表了大质量恒星演化的最后阶段之一。关于这个短暂的阶段,我们所知相对较少,我们目前缺乏可靠的质量,距离和二元性测定的代表性样品。在这里,我们报告的第一个视觉轨道WR 140(= HD 193793),一个WC 7 + O 5的双星系统,其周期性的尘埃生产事件所引发的强烈碰撞风附近的近星点通道。IOTA和CHARA干涉仪从2003年到2009年每年都能分辨出这对恒星,覆盖了大部分高度偏心的7.9年轨道。结合Fahed等(2011)改进的双线分光轨道,我们发现WR 140系统位于距离1.67 +/- 0.03 kpc处,由一颗WR = 14.9 +/- 0.5 Msun的WR星和一颗MO = 35.9 +/- 1.3 Msun的O星组成。我们的精确轨道产生的关键参数的不确定性比以前的工作小6倍,并为系统的详细建模铺平了道路。我们新测得的通量比在近红外H和Ks波段允许SED分解和分析的组件的演化状态。

英文摘要:

Wolf-Rayet stars represent one of the final stages of massive stellar evolution. Relatively little is known about this short-lived phase and we currently lack reliable mass, distance, and binarity determinations for a representative sample. Here we report the first visual orbit for WR 140(=HD193793), a WC7+O5 binary system known for its periodic dust production episodes triggered by intense colliding winds near periastron passage. The IOTA and CHARA interferometers resolved the pair of stars in each year from 2003--2009, covering most of the highly-eccentric, 7.9 year orbit. Combining our results with the recent improved double-line spectroscopic orbit of Fahed et al. (2011), we find the WR 140 system is located at a distance of 1.67 +/- 0.03 kpc, composed of a WR star with M_WR = 14.9 +/- 0.5 Msun and an O star with M_O = 35.9 +/- 1.3 Msun. Our precision orbit yields key parameters with uncertainties times 6 smaller than previous work and paves the way for detailed modeling of the system. Our newly measured flux ratios at the near-infrared H and Ks bands allow an SED decomposition and analysis of the component evolutionary states.

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