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Preliminary investigation of period changes of five RR Lyrae stars in the Globular Cluster M15
Li K(李凯)1,2,3; Qian SB(钱声帮)1,2,3
会议录名称Astronomical Society of the Pacific (ASP) Conference Series - NINTH PACIFIC RIM CONFERENCE ON STELLAR ASTROPHYSICS
2012
卷号451
页码351-354
会议录编者/会议主办者Qian, SB; Leung, KC; Zhu, L; Kwok, S
产权排序第1完成单位
收录类别CPCI
会议名称9th Pacific Rim Conference on Stellar Astrophysics
会议日期2011-04-14
会议地点Lijiang, PEOPLES R CHINA
摘要

More than a century of observations of MI5 allow us to investigate period changes of RR lyrae stars in it. We find five of them to do deep analysis because period changes of the five are very special and simple polynomials can not fit their 0 C diagrams well. The five stars are V11, V13, V15, V40 and V44, respectively. We collect all the times of light maximum from literatures. And then we get our own by observing M15 in November, 2009 using the 60cm telescope in Yunnan Observatory. Base on that we reanalyze period changes of the five stars. We find that all their O-C diagrams can fit by a secular increase or decrease and a cyclic change. If the cyclic changes are caused by the light-travel time effect, they are all in binary systems. Because we could not observe the companion objects from our telescope optically, we think the companion objects are all compact objects, this makes basis for seeking compact objects in Globular Clusters (GCs), and all of the five stars are in the outer region of MI5, so this can make some constrains on the evolution of GCs. The five stars are all RR Lyrae stars, so their period changes can also caused by the Blazhko effect and other mechanisms. We should do more observation and discussion to omit the influence of these factors in the future.

语种英语
学科领域天文学 ; 天体物理学 ; 恒星与银河系
学科门类理学 ; 理学::天文学
文章类型Proceedings Paper
出版者ASTRONOMICAL SOC PACIFIC
出版地390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA
ISBN号978-1-58381-785-8
URL查看原文
归档日期2012-08-06
WOS记录号WOS:000304126300059
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
引用统计
文献类型会议论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5963
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Li K(李凯)
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, 650011 Kunming, P. R. China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences.
3.Graduate School of the CAS, 100049, Beijing, P.R. China/Yuquan Road 19# , SijingShan Block, 100049, Beijing City, P. R. China
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Li K,Qian SB. Preliminary investigation of period changes of five RR Lyrae stars in the Globular Cluster M15[C]//Qian, SB; Leung, KC; Zhu, L; Kwok, S. 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA:ASTRONOMICAL SOC PACIFIC,2012:351-354.
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