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Reconsidering the Bailey diagrams of ab-type RR Lyrae stars, metallicity-mediated evolution as the direct cause of the Oosterhoff phenomenon天文学;天文学::恒星与银河系

文献类型：期刊论文

作者李临甲1; Qian, S -B2,3; 朱俐颖1,4; 施相东1; 廖文萍1,4
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2025-09
卷号542期号:3页码:1791-1802
关键词methods: data analysis stars: fundamental parameters stars: horizontal branch stars: variables: RR Lyrae
ISSN号0035-8711
DOI10.1093/mnras/staf1358
产权排序第1完成单位
文献子类Article
英文摘要We re-examine the Bailey diagrams of fundamental mode RR Lyrae stars from the perspective of horizontal branch (HB) evolution, identifying evolutionary effects as the probable direct cause of the Oosterhoff dichotomy. By establishing empirical relationships between pulsation amplitude and average effective temperature, and utilizing pulsation period relations from non-linear models, we transform theoretical HB evolutionary parameters into pulsation space and map them on to Bailey diagrams. We find that all pulsating Zero-Age Horizontal Branch stars fall within the Oosterhoff type I (OoI) region, with a pronounced period shift effect observed for relatively metal-rich samples ([Fe/H] > -1). Evolutionary tracks confirm that OoI stars are predominantly early-stage HB stars, while Oosterhoff type II stars are highly evolved objects entering the instability strip late in their HB phase from the blue side. Crucially, metallicity plays a dual role: it directly influences pulsation periods through the period relation, but more fundamentally acts as the first parameter influencing HB morphology. This morphology statistically determines whether HB stars predominantly enter the instability strip during early or late evolutionary stages. Consequently, while evolutionary effects directly govern an individual star's position in the Bailey diagram, the population-level Oosterhoff phenomenon emerges from the interplay between these effects and the metallicity-dependent HB morphology. Our study confirms that evolutionary effects are the direct drivers of the period difference and underscores metallicity's vital role in the statistical emergence of Oosterhoff groups. Continued study of this phenomenon offers key insights into the formation history of the Milky Way and nearby dwarf galaxies.
学科主题天文学
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词HORIZONTAL-BRANCH STARS ; GALACTIC GLOBULAR-CLUSTERS ; VARIABLE-STARS ; STELLAR EVOLUTION ; PERIOD GROUPS ; POPULATION SYNTHESIS ; AMPLITUDE RELATION ; OGLE COLLECTION ; HALO ; FIELD
资助项目Yunnan Fundamental Research Projects[202503AP140013]; Yunnan Fundamental Research Projects[202501AS070055]; Yunnan Fundamental Research Projects[202401AS070046]; Yunnan Fundamental Research Projects[202301AT070352]; Yunnan Fundamental Research Projects[202201AT070187]; International Partnership Program of Chinese Academy of Sciences[020GJHZ2023030GC]; China Manned Space Program[CMS-CSST-2025-A16]; CAS 'Light of West China' Program; The 'Yunnan Revitalization Talent Support Program' in Yunnan Province
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001565126100001
出版者OXFORD UNIV PRESS
资助机构Yunnan Fundamental Research Projects[202503AP140013, 202501AS070055, 202401AS070046, 202301AT070352, 202201AT070187] ; International Partnership Program of Chinese Academy of Sciences[020GJHZ2023030GC] ; China Manned Space Program[CMS-CSST-2025-A16] ; CAS 'Light of West China' Program ; The 'Yunnan Revitalization Talent Support Program' in Yunnan Province
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28570]  
专题云南天文台_双星与变星研究组
通讯作者李临甲
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box110, Kunming 650011, Yunnan, China;
2.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, China;
3.Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, China;
4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, No. 1 Yanqihu East Rd, Huairou District, Beijing 101408, China
推荐引用方式
GB/T 7714		 李临甲,Qian, S -B,朱俐颖,等. Reconsidering the Bailey diagrams of ab-type RR Lyrae stars, metallicity-mediated evolution as the direct cause of the Oosterhoff phenomenon天文学;天文学::恒星与银河系[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,542(3):1791-1802.
APA 李临甲,Qian, S -B,朱俐颖,施相东,&廖文萍.(2025).Reconsidering the Bailey diagrams of ab-type RR Lyrae stars, metallicity-mediated evolution as the direct cause of the Oosterhoff phenomenon天文学;天文学::恒星与银河系.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,542(3),1791-1802.
MLA 李临甲,et al."Reconsidering the Bailey diagrams of ab-type RR Lyrae stars, metallicity-mediated evolution as the direct cause of the Oosterhoff phenomenon天文学;天文学::恒星与银河系".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 542.3(2025):1791-1802.

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来源：云南天文台

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