对天鹰座V609星系性质的新认识
New Insights Into the Nature of the Eclipsing System V609 Aquilae
摘要：
对近接触双星（NCB）系统V609 Aql的测光研究显示，它是近距离双星中最西边的一颗恒星，其亮度变化和隐含参数比早期摄影研究中得出的更极端，在早期摄影研究中，变星和伴星的图像几乎可以肯定是混合的。该系统的亮度变化表现出深的主食（$δ$ V = 1.04）和次食（$δ$ V = 0.44）与模型拟合，导出的轨道倾角为i = 84.8 $\pm$ 0.2度，估计的光谱类型为F8-F9和K2-K3。在最佳的日食解中，主波过度填充其罗氏波瓣，这与NCB的定义不一致。周期变化的系统进行了研究，从23个公布的时间的光最小值和21个新建立的值：18从档案哈佛板检查，3从ASAS数据和新的CCD观测。从1891年到2007年，O-C的变化呈现出一种长期的抛物线趋势，表明了一种周期性的减少，dP/dt = -（7.75 $\pm$ 1.39）x 10^-8 d/yr，相当于向次级大气的质量转移为（6.5 $pm$ 1.2）x 10^-8 SM/yr。叠加的变化可以指示质量流量的波动。该系统估计为~513 pc距离。
英文摘要：
A photometric study of the Near Contact Binary (NCB) system V609 Aql reveals it to be the westernmost star of a close double, with brightness variations and implied parameters more extreme than those derived in an earlier photographic study, in which images of the variable and companion were almost certainly blended. The system's brightness variations exhibit deep primary eclipses ($δ$ V = 1.04) and secondary eclipses ($δ$ V = 0.44) matched to a model fit with a derived orbital inclination of i = 84.8$\pm$0.2 degrees and estimated component spectral types of F8-F9 and K2-K3. The primary overfills its Roche lobe in the optimum eclipse solution, inconsistent with the definition of NCBs. Period changes in the system are studied from 23 published times of light minimum and 21 newly-established values: 18 from examination of archival Harvard plates, and 3 from ASAS data and new CCD observations. O-C variations from 1891 to 2007 exhibit a long-term parabolic trend indicative of a period decrease, dP/dt = -(7.75$\pm$1.39) x 10^-8 d/yr, corresponding to mass transfer to the secondary of (6.5$pm$1.2) x 10^-8 SM/yr. Superposed variations may indicate fluctuations in the mass flow. The system is estimated to be ~513 pc distant.
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