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arXiv 0909.1546astro-ph.SR
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相互作用食双星AU Mon的CoRoT光度学和高分辨光谱学

CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Mon

M. Desmet, Y. Fr'emat, F. Baudin, P. Harmanec, P. Lampens, E. Janot Pacheco, M. Briquet, P. Degroote, C. Neiner, P. Mathias, E. Poretti, M. Rainer, K. Uytterhoe… 展开作者

M. Desmet, Y. Fr'emat, F. Baudin, P. Harmanec, P. Lampens, E. Janot Pacheco, M. Briquet, P. Degroote, C. Neiner, P. Mathias, E. Poretti, M. Rainer, K. Uytterhoeven, P. J. Amado, J. -C. Valtier, A. Prsa, C. Maceroni, C. Aerts

摘要:

对非常精确的CoRoT空间测光、过去的约翰逊V光电测光和高分辨率埃歇尔光谱的分析导致确定了AU Mon两个组成部分的改进和一致的基本恒星性质。我们推导出新的,准确的星历的轨道运动(与11.113天)和长期的,整体的亮度变化(与416.9天)的强相互作用的Be + G半分离的二进制。结果表明,这种长期的变化必须是由于一些可变的环双星材料的总光衰减。基于G型次级充满其罗氏瓣并同步旋转的假设,我们推导出了二进制质量比$M_{\rm G}/M_{\rm B}$ = 0.17 \p 0.03。利用这个质量比的值以及G星的径向速度,我们得到了一个一致的光变曲线模型,并改进了恒星质量、半径、光度和有效温度的估计。我们证明了观测到的B型原色谱线可能不是光球源。我们还发现在高质量的残留CoRoT光变曲线中可见快速和周期性的光变化。AU Mon是通过与已知的表现出长期周期性光变化的双星进行比较来透视的。

英文摘要:

Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution échelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Mon. We derived new, accurate ephemerides for both the orbital motion (with a period of 11.113d) and the long-term, overall brightness variation (with a period of 416.9d) of this strongly interacting Be + G semi-detached binary. It is shown that this long-term variation must be due to attenuation of the total light by some variable circumbinary material. We derived the binary mass ratio $M_{\rm G}/M_{\rm B}$ = 0.17\p0.03 based on the assumption that the G-type secondary fills its Roche lobe and rotates synchronously. Using this value of the mass ratio as well as the radial velocities of the G-star, we obtained a consistent light curve model and improved estimates of the stellar masses, radii, luminosities and effective temperatures. We demonstrate that the observed lines of the B-type primary may not be of photospheric origin. We also discover rapid and periodic light changes visible in the high-quality residual CoRoT light curves. AU Mon is put into perspective by a comparison with known binaries exhibiting long-term cyclic light changes.

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