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SDSS J001641-000925: THE FIRST STABLE RED DWARF CONTACT BINARY WITH A CLOSE-IN STELLAR COMPANION

文献类型：期刊论文

作者Qian SB(钱声帮)1,2,3; Jiang LQ(江林巧)1,2,3; Lajus, EF4,5,7; Soonthornthum, B6; Zhu LY(朱俐颖)1,2,3; Zhao EG(赵二刚)1,2; He JJ(何家佳)1,2; Liao WP(廖文萍)1,2; Wang JJ(王晶晶)1,2,3; Liu L(刘亮)1,2,3
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2015-01-10
卷号798期号:2
关键词binaries: close binaries: eclipsing stars: evolution stars: individual (SDSS J001641-000925)
ISSN号2041-8205
产权排序第一完成单位
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
英文摘要SDSS J001641-000925 is the first red dwarf contact binary star with an orbital period of 0.19856 days that is one of the shortest known periods among M-dwarf binary systems. The orbital period was detected to be decreasing rapidly at a rate of P similar to 8 s yr(-1). This indicated that SDSS J001641-000925 was undergoing coalescence via a dynamical mass transfer or loss and thus this red dwarf contact binary is dynamically unstable. To understand the properties of the period change, we monitored the binary system photometrically from 2011 September 2 to 2014 October 1 by using several telescopes in the world and 25 eclipse times were determined. It is discovered that the rapid decrease of the orbital period is not true. This is contrary to the prediction that the system is merging driven by rapid mass transfer or loss. Our preliminary analysis suggests that the observed minus calculated (O-C) diagram shows a cyclic oscillation with an amplitude of 0.00255 days and a period of 5.7 yr. The cyclic variation can be explained by the light travel time effect via the presence of a cool stellar companion with a mass of M-3 sin i' similar to 0.14M(circle dot). The orbital separation between the third body and the central binary is about 2.8AU. These results reveal that the rarity of red dwarf contact binaries could not be explained by rapidly dynamical destruction and the presence of the third body helps to form the red dwarf contact binary.
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]SHORT-PERIOD LIMIT ; SHALLOW CONTACT ; SHORTEST PERIOD ; STARS
收录类别SCI
原文出处http://iopscience.iop.org/article/10.1088/2041-8205/798/2/L42/meta
语种英语
WOS记录号WOS:000347463300016
源URL[http://ir.ynao.ac.cn/handle/114a53/5923]  
专题云南天文台_双星与变星研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
5.Instituto de Astrofisica de La Plata (CCT La plata - CONICET/UNLP), Argentina
6.National Astronomical Research Insititude of Thailand, 191 Siriphanich Bldg., Huay Kaew Road, Chiang Mai 50200, Thailand
7.Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
推荐引用方式
GB/T 7714		 Qian SB,Jiang LQ,Lajus, EF,et al. SDSS J001641-000925: THE FIRST STABLE RED DWARF CONTACT BINARY WITH A CLOSE-IN STELLAR COMPANION[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,798(2).
APA Qian SB.,Jiang LQ.,Lajus, EF.,Soonthornthum, B.,Zhu LY.,...&Liu NP.(2015).SDSS J001641-000925: THE FIRST STABLE RED DWARF CONTACT BINARY WITH A CLOSE-IN STELLAR COMPANION.ASTROPHYSICAL JOURNAL LETTERS,798(2).
MLA Qian SB,et al."SDSS J001641-000925: THE FIRST STABLE RED DWARF CONTACT BINARY WITH A CLOSE-IN STELLAR COMPANION".ASTROPHYSICAL JOURNAL LETTERS 798.2(2015).

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来源：云南天文台

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