V1507 Cygni (HD187399)：一个具有偏心轨道的高度演化、性质神秘的相互作用双星系统
V1507 Cygni (HD187399): A Highly Evolved, Enigmatic Interacting Binary System with an Eccentric Orbit
AI总结：
本研究通过光谱观测分析了相互作用双星V1507 Cyg的性质，确定其质量比反转的演化状态、Alpha Cyg型变星属性及偏心轨道的等级系统演化起源。
摘要：
本文利用覆盖0.63至0.68微米波长的光谱，研究了具有偏心轨道的相互作用双星V1507 Cyg（HD187399）的性质。该系统中最亮恒星的光谱与B8 I型恒星Beta Ori非常相似，但其吸收线呈现出与变化潮汐场一致的子结构。光谱中大部分Hα发射线似乎与这颗更亮的恒星相关。研究证据表明，该系统的周期在数十年的时间尺度上保持稳定，排除了当前阶段存在大规模物质转移的可能。研究识别出来自伴星周围膨胀的不对称包层的吸收线和发射线，测得两颗子星的质量分别为6.4±0.9倍太阳质量和14.0±0.9倍太阳质量，其中前者对应更亮的恒星，计算时假设轨道倾角为46度。V1507 Cyg的演化状态为：物质转移已进行到质量比发生反转的阶段，更亮的恒星已被剥离了大部分初始质量。研究认为，这颗更亮的恒星是一颗Alpha Cyg型变星，其光度变化主导了整个系统的光变曲线。观测发现V1507 Cyg位于一个在408和1420MHz探测到的弥漫HI泡的中心或近中心位置。研究提出，该系统的偏心轨道是等级系统演化的结果。
英文摘要：
The properties of the interacting, eccentric orbit binary V1507 Cyg (HD187399) are examined with spectra that cover wavelengths from 0.63 to 0.68um. The spectrum of the brightest star is very similar to that of the B8 I star Beta Ori, although with absorption lines that show sub-structure consistent with a varying tidal field. The bulk of the Halpha emission in the spectrum appears to be associated with the brighter star. Evidence is presented that the period of the system has been stable over timescales of many decades, arguing against large-scale mass transfer at the current epoch. Absorption and emission lines are identified that originate in an expanding asymmetric envelope around the companion, and component masses of 6.4 +/- 0.9 and 14.0 +/- 0.9 solar are found, where the former applies to the brighter star and an inclination of 46 degrees has been assumed. The evolutionary state of V1507 Cyg is then that of a system in which mass transfer has progressed to the point where the mass ratio has been reversed, with the brighter star stripped of much of its initial mass. It is argued that the brighter star is an Alpha Cyg variable, and that it is those light variations that dominate the system light curve. V1507 Cyg is observed at or near the center of a diffuse HI bubble that is detected at 408 and 1420MHz. It is suggested that the eccentric orbit is the result of evolution in a hierarchical system.
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