DETECTION OF A TERTIARY BROWN DWARF COMPANION IN THE sdB-TYPE ECLIPSING BINARY HS 0705+6700

doi:10.1088/0004-637X/695/2/L163

YNAO OpenIR > 双星与变星研究组

	DETECTION OF A TERTIARY BROWN DWARF COMPANION IN THE sdB-TYPE ECLIPSING BINARY HS 0705+6700
	Qian SB(钱声帮)1,2,3 ; Zhu LY(朱俐颖)1,2,3 ; Zola, S 4,5; Liao WP(廖文萍)1,2,3 ; Liu L(刘亮)1,2,3 ; Li LJ(李临甲)1,2,3 ; Winiarski, M 5; Kuligowska, E 4; Kreiner, JM 5; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL LETTERS
	2009-04-20
卷号	695 期号:2 页码:L163-L165
DOI	10.1088/0004-637X/695/2/L163
产权排序	第1完成单位
收录类别	SCI
关键词	Binaries: Close Binaries: Eclipsing Stars: Individual (Hs 0705+6700) Stars: Low-mass Brown Dwarfs Subdwarfs
摘要	HS 0705+6700 is a short-period (P = 2.3 hr), close binary containing a hot sdB-type primary and a fully convective secondary. We have monitored this eclipsing binary for more than two years and as a result, 32 times of light minimum were obtained. Based on our new eclipse times together with these compiled from the literature, it is discovered that the observed-calculated curve of HS 0705+6700 shows a cyclic variation with a period of 7.15 years and a semiamplitude of 92.4 s. The periodic change was analyzed for the light-travel time effect that may be due to the presence of a tertiary companion. The mass of the third body is determined to be M3 sin i' = 0.0377(+/- 0.0043) M(circle dot) when a total mass of 0.617 M(circle dot) for HS 0705+6700 is adopted. For orbital inclinations i' >= 32.degrees 8, the mass of the tertiary component would be below the stable hydrogen-burning limit of M(3) similar to 0.072M(circle dot), and thus it would be a brown dwarf. The third body is orbiting the sdB-type binary at a distance shorter than 3.6 AU. HS 0705+6700 was formed through the evolution of a common envelope after the primary becomes a red giant. The detection of a substellar companion in HS 0705+6700 system at this distance from the binary could give some constraints on stellar evolution in such systems and the interactions between red giants and their companions.
项目资助者	Chinese Natural Science Foundation [10778718, 10778707] ; National Key Fundamental Research Project [2007CB815406] ; Yunnan Natural Science Foundation [2008CD157] ; Special Foundation of President ; West Light Foundation of the Chinese Academy of Sciences
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	2041-8205
URL	查看原文
归档日期	2009-05-21
WOS记录号	WOS:000264872100009
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	PRE-CATACLYSMIC BINARY ; SUBDWARF-B STARS ; HW VIR-TYPE ; MAGNETIC BRAKING ; PERIOD DECREASE ; CLOSE BINARIES ; ORBITAL PERIOD
引用统计	被引频次：61[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5825
专题	双星与变星研究组
通讯作者	Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, People's Republic of China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, People's Republic of China 3.Graduate University of the Chinese Academy of Sciences, 10049 Beijing, People's Republic of China 4.Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland 5.Mt. Suhora Observatory, Cracow Pedagogical University ul. Podchorazych 2, 30-084 Krakow, Poland
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Qian SB,Zhu LY,Zola, S,et al. DETECTION OF A TERTIARY BROWN DWARF COMPANION IN THE sdB-TYPE ECLIPSING BINARY HS 0705+6700[J]. ASTROPHYSICAL JOURNAL LETTERS,2009,695(2):L163-L165.
APA	Qian SB.,Zhu LY.,Zola, S.,Liao WP.,Liu L.,...&Qian, SB .(2009).DETECTION OF A TERTIARY BROWN DWARF COMPANION IN THE sdB-TYPE ECLIPSING BINARY HS 0705+6700.ASTROPHYSICAL JOURNAL LETTERS,695(2),L163-L165.
MLA	Qian SB,et al."DETECTION OF A TERTIARY BROWN DWARF COMPANION IN THE sdB-TYPE ECLIPSING BINARY HS 0705+6700".ASTROPHYSICAL JOURNAL LETTERS 695.2(2009):L163-L165.

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