Period Changes of the Algol System SZ Herculis

被引：0
作者：
Lee, J. W. [1 ]
Lee, C. -U. [1 ]
Kim, S. -L. [1 ]
Kim, H. -I. [1 ]
Park, J. -H. [1 ]
Hinse, T. C. [1 ]
机构：
[1] Korea Astron & Space Sci Inst, Taejon 305348, South Korea
来源：
FROM INTERACTING BINARIES TO EXOPLANETS: ESSENTIAL MODELING TOOLS | 2012年 / 282期
关键词：
binaries: close; binaries: eclipsing; stars: individual (SZ Herculis);
D O I：
10.1017/S1743921311027670
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
New CCD photometric observations of SZ Her were obtained between February and May 2008. More than 1,100 times of minimum light spanning more than one century were used for the period analysis. We find that the orbital period of SZ Her has varied due to a combination of two periodic variations, with cycle lengths of P-3=85.8 yr and P-4=42.5 yr and semi-amplitudes of K-3=0.013 days and K-4=0.007 days, respectively. The most reasonable explanation for them is a pair of light-time-travel (LTT) effects driven by the existence of two M-type companions with minimum masses of M-3=0.22 M-circle dot and M-4=0.19 M-circle dot, located at nearly 2:1 mean motion resonance. Then, SZ Her is a quadruple system and the 3rd and 4th components would stay in the stable orbital resonance.
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页码：313 / 314
页数：2
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