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TY Pup: A Low-mass-ratio and Deep Contact Binary as a Progenitor Candidate of Luminous Red Novae
Sarotsakulchai, T.1,2,3; Qian SB(钱声帮)1,2,4,5; Soonthornthum, B.3; Zhou X(周肖)1,4,5; Zhang J(张嘉)1,4,5; Reichart, D. E.6; Haislip, J. B.6; Kouprianov, V. V.6; Poshyachinda, S.3
发表期刊ASTRONOMICAL JOURNAL
2018-11-01
卷号156期号:5页码:11
DOI10.3847/1538-3881/aadcfa
收录类别SCI
关键词binaries: close binaries: eclipsing stars: evolution stars: individual (TY Pup)
摘要

TY Pup is a well-known bright eclipsing binary with an orbital period of 0.8192 days. New light curves in B, V, (RI)(C) bands were obtained with the 0.61 m reflector robotic telescope (PROMPT-8) at CTIO in Chile during 2015 and 2017. By analyzing those photometric data with the W-D method, it is found that TY Pup is a low-mass-ratio (q similar to 0.184) and deep-contact binary with a high fill-out factor (84.3%). An investigation of all available times of minimum light including three new ones obtained with the 60 cm and the 1.0 m telescopes at Yunnan Observatories in China indicates that the period change of TY Pup is complex. An upward parabolic variation in the O - C diagram is detected to be superimposed on a cyclic oscillation. The upward parabolic change reveals a long-term continuous increase in the orbital period at a rate of dP/dt = 5.57(+/- 0.08) x 10(-8) days yr(-1). The period increase can be explained by mass transfer from the less massive component (M-2 similar to 0.3 M-circle dot) to the more massive one (M-1 similar to 1.65 M-circle dot). The binary will be merging when it meets the criterion that the orbital angular momentum is less than three times the total spin angular momentum, i.e., J(orb) < 3J(rot). This suggests that the system will finally merge into a rapid-rotating single star and may produce a luminous red nova. The cyclic oscillation in the O - C diagram can be interpreted by the light-travel time effect via the presence of a third body.

资助项目National Natural Science Foundation of China[11703082]
项目资助者National Natural Science Foundation of China[11703082]
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS记录号WOS:000447164500009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; SKY AUTOMATED SURVEY ; ADDITIONAL COMPONENTS ; LIGHT CURVES ; EFFECTIVE TEMPERATURES ; BOLOMETRIC CORRECTIONS ; ECLIPSING BINARIES ; STARS ; SYSTEMS ; PARAMETERS
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18023
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Sarotsakulchai, T.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, People's Republic of China
2.University of Chinese Academy of Sciences, 19 A Yuquan Rd., Shijingshan, 100049 Beijing, People's Republic of China
3.National Astronomical Research Institute of Thailand, Ministry of Science and Technology, Bangkok, Thailand
4.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, People's Republic of China
5.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Rd., Chaoyang District, Beijing, 100012, People's Republic of China
6.Department of Physics and Astronomy, University of North Carolina, CB #3255, Chapel Hill, NC 27599, USA
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Sarotsakulchai, T.,Qian SB,Soonthornthum, B.,et al. TY Pup: A Low-mass-ratio and Deep Contact Binary as a Progenitor Candidate of Luminous Red Novae[J]. ASTRONOMICAL JOURNAL,2018,156(5):11.
APA Sarotsakulchai, T..,Qian SB.,Soonthornthum, B..,Zhou X.,Zhang J.,...&Poshyachinda, S..(2018).TY Pup: A Low-mass-ratio and Deep Contact Binary as a Progenitor Candidate of Luminous Red Novae.ASTRONOMICAL JOURNAL,156(5),11.
MLA Sarotsakulchai, T.,et al."TY Pup: A Low-mass-ratio and Deep Contact Binary as a Progenitor Candidate of Luminous Red Novae".ASTRONOMICAL JOURNAL 156.5(2018):11.
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