کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1779860 | 1022050 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
VZ Librae: A truly unsolved quadruple system containing double close binaries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
New orbital period and period variation of the W UMa-type eclipsing binary, VZ Librae, are presented. It is discovered that the orbital period of VZ Librae shows a periodic change with an amplitude of 0.0200 d and a period of 17.1 year. The cyclic period change can be explained as the light travel-time orbit of a tertiary component in the system. This is consistent with the spectroscopic results by Lu et al. [Lu, W.-X., Rucinski, S.M., Ogloza, W., 2001. AJ 122, 402] who found a faint spectroscopic companion in the system (VZ Librae B) that may be a close binary. Based on the light travel-time analysis, it is shown that the mass of the tertiary component is no less than 1.07Mâ, which is much larger than that (M3 â¼Â 0.67Mâ) estimated by D'Angelo et al. [D'Angelo, C., van Kerkwijk, M.H., Rucinski, S.M., 2006. AJ 132, 650]. This finding, in combination with its low luminosity, indicates that the spectroscopic companion is a close binary star suggesting that VZ Librae is an unsolved quadruple system containing double close binary stars in a separation less than 7.2 AU. As in the case of V899 Herculis, it is a good astrophysical laboratory to study the formation and evolution of overcontact binaries and multiple systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 13, Issue 2, February 2008, Pages 98-102
Journal: New Astronomy - Volume 13, Issue 2, February 2008, Pages 98-102
نویسندگان
S.-B. Qian, W.-P. Liao, L. Liu, J.-Z. Yuan, J.-J. He, L.-Y. Zhu, Z.-B. Dai, J. Zhang,