TIME-SERIES SPECTROSCOPY OF THE ECLIPSING BINARY Y CAM WITH A PULSATING COMPONENT
TIME-SERIES SPECTROSCOPY OF THE ECLIPSING BINARY Y CAM WITH A PULSATING COMPONENT
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具有脉动分量的食二元 Y 凸轮的时间序列光谱
DOI：
10.1088/0004-6256/150/4/131
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Kang
中科院分区：
文献类型：
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作者：
K. Hong;Jae Woo Lee;Seung;J. Koo;Chung;A. Yushchenko;Y. Kang
基于Bohyunsan光学回声光谱仪获得的高分辨率光谱，我们给出了半分离Algol型食双星Y凸轮的物理性质。这是对这个有趣的双星系统获得的第一个光谱监测数据，它具有δSCT型脉动组件。从2009年12月到2011年3月的14个晚上，我们总共获得了59个光谱。热的初级成分和冷的次级成分的双线光谱特征被很好地识别出来。我们测得这两颗恒星的有效温度分别为：Teff，1=8000±250K和Teff，2=4629±150K，投影自转速度为v1sin i1=51±4 km S−1和v2sin i2=50±10 km S−1，这与轨道运动的同步自转非常相似。通过分析我们的径向速度数据，结合文献中以前的光度光曲线，得出了每个组件的物理参数。肿块M_1=2.08±0.09M⊙，M_2=0.48±0.03M⊙，R_1=3.14±0.05R⊙，R_2=3.33±0.05R⊙。这些参数与理论演化轨迹的对比表明，主组分位于零时代主层序和末期主层序之间，而低质量次生组分明显演化。这表明这两个组件经历了相互的质量交换，而初级组件经历了一个不同于单个δSCT型脉冲器的演化过程。
We present the physical properties of the semi-detached Algol-type eclipsing binary Y Cam based on high resolution spectra obtained using the Bohyunsan Optical Echelle Spectrograph. This is the first spectroscopic monitoring data obtained for this interesting binary system, which has a δ Sct-type pulsating component. We obtained a total of 59 spectra over 14 nights from 2009 December to 2011 March. Double-lined spectral features from the hot primary and cool secondary components were well identified. We determined the effective temperatures of the two stars to be Teff,1 = 8000 ± 250 K and Teff,2 = 4629 ± 150 K. The projected rotational velocities are v1sin i1 = 51 ± 4 km s−1 and v2sin i2 = 50 ± 10 km s−1, which are very similar to a synchronous rotation with the orbital motion. Physical parameters of each component were derived by analyzing our radial velocity data together with previous photometric light curves from the literature. The masses and radii are M1 = 2.08 ± 0.09 M⊙, M2 = 0.48 ± 0.03 M⊙, R1 = 3.14 ± 0.05 R⊙, and R2 = 3.33 ± 0.05 R⊙, respectively. A comparison of these parameters with the theoretical evolution tracks showed that the primary component is located between the zero-age main sequence and the terminal-age main sequence, while the low-mass secondary is noticeably evolved. This indicates that the two components have experienced mass exchange with each other and the primary has undergone an evolution process different from that of single δ Sct-type pulsators.