THE LIKELY ORBITAL PERIOD OF THE ULTRACOMPACT LOW-MASS X-RAY BINARY 2S 0918-549
文献类型：期刊论文
| 作者 | Zhong, Jing ; Wang, Zhongxiang
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-03-01 |
| 卷号 | 729期号:1页码:1 |
| 关键词 | binaries: close stars: individual (2S 0918-549) stars: low-mass stars: neutron X-rays: binaries |
| 英文摘要 | We report the discovery of the likely orbital period of the ultracompact low-mass X-ray binary (LMXB) 2S 0918-549. Using time-resolved optical photometry carried out with the 8 m Gemini South Telescope, we obtained a 2.4 hr long, Sloan r' light curve of 2S 0918-549 and found a periodic, sinusoidal modulation at 17.4 +/- 0.1 minutes with a semiamplitude of 0.015 +/- 0.002 mag, which we identify as the binary period. In addition to 4U 0513-40 in the globular cluster NGC 1851 and the Galactic disk source 4U 1543-624, 2S 0918-549 is the third member of the ultracompact LMXBs that have orbital periods around 18 minutes. Our result verifies the suggestion that 2S 0918-549 is an ultracompact binary based on its X-ray and optical spectroscopic properties. Given that the donor in 2S 0918-549 has been suggested to be either a C-O or He white dwarf, its likely mass and radius are around 0.024-0.029 M-circle dot and 0.03-0.032 R-circle dot, respectively, for the former case and 0.034-0.039 M-circle dot and 0.033-0.035 R-circle dot for the latter case. If the optical modulation arises from X-ray heating of the mass donor, its sinusoidal shape suggests that the binary has a low inclination angle, probably around 10 degrees. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RICH DEGENERATE DONORS ; WHITE-DWARF DONORS ; 2S-0918-549 ; 4U-1543-624 ; EVOLUTION ; SUPERHUMPS ; SYSTEMS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000287255300008 |
| 源URL | [http://119.78.226.72/handle/331011/28108]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhong, Jing,Wang, Zhongxiang. THE LIKELY ORBITAL PERIOD OF THE ULTRACOMPACT LOW-MASS X-RAY BINARY 2S 0918-549[J]. ASTROPHYSICAL JOURNAL,2011,729(1):1. |
| APA | Zhong, Jing,&Wang, Zhongxiang.(2011).THE LIKELY ORBITAL PERIOD OF THE ULTRACOMPACT LOW-MASS X-RAY BINARY 2S 0918-549.ASTROPHYSICAL JOURNAL,729(1),1. |
| MLA | Zhong, Jing,et al."THE LIKELY ORBITAL PERIOD OF THE ULTRACOMPACT LOW-MASS X-RAY BINARY 2S 0918-549".ASTROPHYSICAL JOURNAL 729.1(2011):1. |
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来源：上海天文台
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