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DISCOVERY OF 14 NEW SLOWLY PULSATING B STARS IN THE OPEN CLUSTER NGC 7654
Luo YP(罗杨平)1,2,3; Zhang, XB4; Deng, LC4; Han ZW(韩占文)1,2; Luo, YP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2012-02-10
卷号746期号:1
DOI10.1088/2041-8205/746/1/L7
产权排序第1完成单位
收录类别SCI
关键词Open Clusters And Associations: Individual (Ngc 7654) Stars: Oscillations Stars: Variables: General Techniques: Photometric
摘要We carried out time-series BV CCD photometric observations of the open cluster NGC 7654 (Messier 52) to search for variable stars. Eighteen slowly pulsating B (SPB) stars have been detected, among which 14 candidates are newly discovered, three known ones are confirmed, and a previously found delta Scuti star is also identified as an SPB candidate. Twelve SPBs are probable cluster members based on membership analysis. This makes NGC 7654 the richest galactic open cluster in terms of SPB star content. It is also a new discovery that NGC 7654 hosts three gamma Dor star candidates. We found that all these stars (18 SPB and 3 gamma Dor stars) have periods longer than their corresponding fundamental radial mode. With such a big sample of g-mode pulsators in a single cluster, it is clear that multi-mode pulsation is more common in the upper part of the main sequence than in the lower part. All the stars span a narrow strip on the period-luminosity plane, which also includes the gamma Dor stars at the low-luminosity extension. This result implies that there may be a single period-luminosity relation applicable to all g-mode main-sequence pulsators. As a by-product, three EA-type eclipsing binaries and an EW-type eclipsing binary are also discovered.
项目资助者National Natural Science Foundation of China [10821061, 11033008, 11103073] ; National Basic Research Program of China [2007CB815406] ; Chinese Academy of Sciences [KJCX2-YW-T24]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN2041-8205
URL查看原文
归档日期2012-03-12
WOS记录号WOS:000300323500007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]VARIABLE-STARS ; FIELD ; PHOTOMETRY ; NGC-188 ; SEARCH
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/4542
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Luo, YP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
第一作者单位中国科学院云南天文台
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Luo YP,Zhang, XB,Deng, LC,et al. DISCOVERY OF 14 NEW SLOWLY PULSATING B STARS IN THE OPEN CLUSTER NGC 7654[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,746(1).
APA Luo YP,Zhang, XB,Deng, LC,Han ZW,&Luo, YP .(2012).DISCOVERY OF 14 NEW SLOWLY PULSATING B STARS IN THE OPEN CLUSTER NGC 7654.ASTROPHYSICAL JOURNAL LETTERS,746(1).
MLA Luo YP,et al."DISCOVERY OF 14 NEW SLOWLY PULSATING B STARS IN THE OPEN CLUSTER NGC 7654".ASTROPHYSICAL JOURNAL LETTERS 746.1(2012).
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