A search for open cluster Cepheids in the Galactic plane

	A search for open cluster Cepheids in the Galactic plane
	Chen, Xiaodian 1,2,3; de Grijs, Richard 1,2; Deng, Licai3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-01-11
卷号	446 期号:2 页码:1268-1282
关键词	methods: data analysis stars: variables: Cepheids open clusters and associations: general distance scale
英文摘要	We analyse all potential combinations of Galactic Cepheids and open clusters (OCs) in the most up-to-date catalogues available. Isochrone fitting and proper-motion calculation are applied to all potential OC-Cepheid combinations. Five selection criteria are used to select possible OC Cepheids: (i) the Cepheid of interest must be located within 60 arcmin of the OC's centre; (ii) the Cepheid's proper motion is located within the 1 sigma distribution of that of its host OC; (iii) the Cepheid is located in the instability strip of its postulated host OC; (iv) the Cepheid and OC distance moduli should differ by less than 1 mag; and (v) the Cepheid and OC ages (and, where available, their metallicities) should be comparable: Delta log (t yr(-1)) < 0.3. 19 possible OC Cepheids are found based on our near-infrared (NIR) analysis; eight additional OC-Cepheid associations may be genuine pairs for which we lack NIR data. Six of the Cepheids analysed at NIR wavelengths are new, high-probability OC Cepheids, since they lie on the NIR period (P)-luminosity relation (PLR). These objects include TY Sct and CN Sct in Dolidze 34, XX Sgr in Dolidze 52, CK Sct in NGC 6683, VY Car in ASCC 61 and U Car in Feinstein 1. Two additional new OC Cepheids lack NIR data: V0520 Cyg in NGC 6991 and CS Mon in Juchert 18. The NIR PLR for our confirmed sample of OC Cepheids is M-J = (-3.12 +/- 0.29) log (Pd-1) - (2.17 +/- 0.29) mag, which is in good agreement with the best NIR PLR available for all Galactic Cepheids.
收录类别	SCI
语种	英语
WOS记录号	WOS:000350272200015
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5720]
专题	国家天文台_光学天文研究部
作者单位	1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Chen, Xiaodian,de Grijs, Richard,Deng, Licai. A search for open cluster Cepheids in the Galactic plane[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,446(2):1268-1282.
APA	Chen, Xiaodian,de Grijs, Richard,&Deng, Licai.(2015).A search for open cluster Cepheids in the Galactic plane.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,446(2),1268-1282.
MLA	Chen, Xiaodian,et al."A search for open cluster Cepheids in the Galactic plane".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446.2(2015):1268-1282.