Photometric study of the eclipsing blue straggler V205 in the globular cluster NGC 5139
Li, K.1,2; Li, K.(Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China)
发表期刊NEW ASTRONOMY
2018-02-01
卷号59页码:60-64
DOI10.1016/j.newast.2017.09.004
收录类别SCI
关键词Galaxies Globular Clusters Individual(Ngc 5139) - Stars Binaries Close - Stars Binaries Eclipsing - Stars Blue Stragglers - Stars Individual (V205)
摘要B and V light curves of an EA-type binary V205 in the globular cluster NGC 5139 are analyzed by the W-D program. We found that V205 is possibly a detached binary and the mass ratio is 0.1596. The secondary component is touching or nearly touching its inner Roche Lobe. By studying the O-C diagram of V205, we discovered that the orbital period is continuously decrease at a rate of dp/dt = 1.89(+/- 0.01) x 10(-7) d yr(-1) and should be caused by angular momentum and mass loss. The angular momentum loss will drive it evolve into a contact binary. Since V205 is a proper motion member of NGC 5139, we estimated its absolute parameters based on the distance modulus of the cluster and determined that: a = 2.50R(circle dot), M-1 = 0:76M(circle dot), R-1 = 1,14R(circle dot), L-1= 5.46L(circle dot,) M-2 = 0.12M(circle dot), R-2 = 0.52 R-circle dot,R- and L-2 = 0.70 L-circle dot. V205 occupied the blue straggler stars on the color-magnitude diagram of NGC 5139. It is an eclipsing blue straggler and is most possibly formed by mass transfer between the two components. Since original short-period systems similar to V205 should be evolved in such a long life time of the globular cluster, the short period binary should undergo special evolutionary stages. High accuracy photometric and high resolution spectral observations are essential for this unusual system. (C) 2017 Elsevier B.V. All rights reserved.
项目资助者National Natural Science Foundation of China ; Chinese Academy of Sciences(U1431105) ; Natural Science Foundation of Shandong Province(ZR2014AQ019) ; Shandong University, Weihai(2016WHWLJH07) ; Key Laboratory for the Structure and Evolution of Celestial Objects(OP201303)
语种英语
学科领域天文学
文章类型Article
ISSN1384-1076
URL查看原文
WOS记录号WOS:000415773000010
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ANGULAR-MOMENTUM LOSS ; ALGOL-TYPE BINARIES ; OMEGA-CENTAURI ; POSSIBLE MASS ; STAR LIGHT ; VARIABLE-STARS ; CATALOG ; CURVES ; PERIOD ; DELPHINI
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11954
专题中国科学院天体结构与演化重点实验室
通讯作者Li, K.(Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China)
作者单位1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China
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Li, K.,Li, K.. Photometric study of the eclipsing blue straggler V205 in the globular cluster NGC 5139[J]. NEW ASTRONOMY,2018,59:60-64.
APA Li, K.,&Li, K..(2018).Photometric study of the eclipsing blue straggler V205 in the globular cluster NGC 5139.NEW ASTRONOMY,59,60-64.
MLA Li, K.,et al."Photometric study of the eclipsing blue straggler V205 in the globular cluster NGC 5139".NEW ASTRONOMY 59(2018):60-64.
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