N. Scoville, K. Sheth, F. Walter, S. Manohar, L. Zschaechner, M. Yun, J. Koda, D. Sanders, L. Murchikova, T. Thompson, B. Robertson, R. Genzel, L. Hernquist, L. Tacconi, Robert Brown, D. Narayanan, C. Hayward, J. Barnes, J. Kartaltepe, R. Davies, P. V. D. Werf, E. Fomalont
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引用次数: 0
摘要
我们对M0V+M5V RS CVn双星V405仙女座的短周期(Porb = 11.2 hr)食相进行了多历元时间分辨高分辨率光学光谱研究。利用间接成像技术,即多普勒成像技术,研究了该系统M0V分量的表面活动性特征。将考虑恒星表面潮汐畸变的多普勒成像码的改进版本应用于多历元数据集,以提供恒星表面的间接图像。多历元的表面亮度分布显示,在纬度±40◦处有一个低强度的黑子“带”,在仙女座V405主星上明显没有高纬度特征或极黑子。它们还揭示了光斑分布在约4年内的缓慢演变。为了找到导致最平滑表面亮度分布的二进制参数集,使用了熵景观程序。因此,我们发现M1 = 0.51±0.03 M, M2 = 0.21±0.01 M, R1 = 0.71±0.01 R,倾角i = 65◦±1◦。由此产生的系统速度在不同的时期是不同的,这增加了系统中存在第三个物体的可能性。
We present a multi-epoch time-resolved high-resolution optical spectroscopy study of the short-period (Porb = 11.2 hr) eclipsing M0V+M5V RS CVn binary V405 Andromeda. By means of indirect imaging techniques, namely Doppler imaging, we study the surface activity features of the M0V component of the system. A modified version of a Doppler imaging code, which takes into account the tidal distortion of the surface of the star, is applied to the multi-epoch data set in order to provide indirect images of the stellar surface. The multi-epoch surface brightness distributions show a low intensity “belt” of spots at latitudes ±40◦ and a noticeable absence of high latitude features or polar spots on the primary star of V405 Andromeda. They also reveal slow evolution of the spot distribution over ∼4 yr. An entropy landscape procedure is used in order to find the set of binary parameters that lead to the smoothest surface brightness distributions. As a result, we find M1 = 0.51 ± 0.03 M , M2 = 0.21 ± 0.01 M , R1 = 0.71 ± 0.01 R , and an inclination i = 65◦ ± 1◦. The resulting systemic velocity is distinct for different epochs, raising the possibility of the existence of a third body in the system.