主序列前移位二进制ASAS J052821 +0338.5
The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5
摘要：
在本文中，我们提出了详细的光谱和光度分析的V = 11.7米食双星ASAS J 052821 +0338.5的第一个结果。利用北欧光学望远镜的FIES摄谱仪，我们获得了一系列覆盖整个系统轨道的高分辨率光谱（R=47000）。此外，我们获得了同时从三个小口径望远镜的宽带测光。从这些光谱和光度数据中，我们导出了系统的轨道参数，并确定了这两个组成部分的基本恒星参数。结果表明，ASAS J 052821 +0338.5是一颗K1/K3主序前食双星，质量分别为1.38 M_su，1.33 M_su，3.87天周期，距离280 ± 30 pc。这两颗恒星的运动学、物理位置和演化状态表明，ASAS J 052821 +0338.5是大约1100万年前的猎户座OB 1a子星协的成员。该系统还表现出平滑的0.15米的食外变化，类似于RS CVn双星。此外，我们得到的参数与流行的Baraffe恒星演化模型的10-13百万年等时线一致。
英文摘要：
In this paper we present the first results of a detailed spectroscopic and photometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5. With the FIES spectrograph at the Nordic Optical Telescope we have obtained a series of high-resolution spectra (R=47000) covering the entire orbit of the system. In addition we obtained simultaneous broadband photometry from three small aperture telescopes. From these spectroscopic and photometric data we have derived the system's orbital parameters and determined the fundamental stellar parameters of the two components. Our results indicate that ASAS J052821+0338.5 is a K1/K3 pre-main-sequence eclipsing binary, with component masses of 1.38 M_sun and 1.33 M_sun and a period of 3.87 days, located at a distance of 280 +/- 30 pc. The kinematics, physical location and the evolutionary status of the two stars suggest that ASAS J052821+0338.5 is a member of the approximately 11 Myr old Orion OB1a subassociation. The systems also exhibits smooth 0.15m out-of-eclipse variations that are similar to those found in RS CVn binaries. Furthermore the parameters we derived are consistent with the 10-13 Myr isochrones of the popular Baraffe stellar evolutionary models.
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