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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
Source PublicationASTRONOMICAL JOURNAL
2018-11-01
Volume156Issue:5Pages:11
DOI10.3847/1538-3881/aadcfa
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: evolution stars: individual (TY Pup)
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11703082]
Funding OrganizationNational Natural Science Foundation of China[11703082]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS IDWOS:000447164500009
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; SKY AUTOMATED SURVEY ; ADDITIONAL COMPONENTS ; LIGHT CURVES ; EFFECTIVE TEMPERATURES ; BOLOMETRIC CORRECTIONS ; ECLIPSING BINARIES ; STARS ; SYSTEMS ; PARAMETERS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18023
Collection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
Corresponding AuthorSarotsakulchai, T.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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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