Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates

doi:10.3847/1538-3881/aaa45b

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	Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates
	Yu, Po-Chieh 9; Yu, Chang-Hsien 9; Lee, Chien-De 9; Lin, Chien-Cheng 1,2; Hsia, Chih-Hao 3; Chang, Chang-Kao 9; Chen, I-Chenn 9; Ngeow, Chow-Choong 9; Ip, Wing-Huen 3,4,9; Chen, Wen-Ping 5,9
刊名	ASTRONOMICAL JOURNAL
	2018-02-01
卷号	155 期号:2
关键词	Open Clusters And Associations: General Stars: Emission-line, Be Stars: General Surveys
ISSN号	0004-6256
DOI	10.3847/1538-3881/aaa45b
英文摘要	We conducted a search for Be star candidates in open clusters using Ha imaging photometry of the Palomar Transient Factory Survey to investigate some connections among Be star phenomena, cluster environments, and ages. Stellar members of clusters were identified by spatial distributions, near-infrared magnitudes and colors, and by proper motions. Among 104 open clusters, we identified 96 Be star candidates in 32 clusters; 11 of our candidates have been reported in previous studies. We found that the clusters with age 7.5 < log(t(year)) <= 8.5 tend to have more Be star candidates; there is about a 40% occurrence rate within this age bin. The clusters in this age bin also tend to have a higher Be fraction N(Be)/N(Be+B-type). These results suggest that the environments of young and intermediate clusters are favorable to the formation of Be phenomena. Spatial distribution of Be star candidates with different ages implies that they do not form preferentially in the central regions. Furthermore, we showed that the mid-infrared (MIR) colors of the Be star candidates are similar to known Be stars, which could be caused by free-free emission or bound-free emission. Some Be star candidates might have no circumstellar dust according to their MIR colors. Finally, among 96 Be candidates, we discovered that one Be star candidate FSR 0904-1 exhibits long-term variability on the timescale of similar to 2000 days with an amplitude of 0.2-0.3 mag, indicating a long timescale of disk evolution.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000423450100003
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32515]
专题	中国科学院上海天文台
通讯作者	Yu, Po-Chieh
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 3.Macau Univ Sci & Technol, Space Sci Inst, Ave Wai Long, Taipa, Macau, Peoples R China 4.Natl Cent Univ, Inst Space Sci, 300 Zhongda Rd, Taoyuan 32001, Taiwan 5.Natl Cent Univ, Dept Phys, 300 Zhongda Rd, Taoyuan 32001, Taiwan 6.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA 7.CALTECH, Spitzer Sci Ctr, M-S 314-6, Pasadena, CA 91125 USA 8.CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA 9.Natl Cent Univ, Grad Inst Astron, 300 Zhongda Rd, Taoyuan 32001, Taiwan
推荐引用方式 GB/T 7714	Yu, Po-Chieh,Yu, Chang-Hsien,Lee, Chien-De,et al. Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates[J]. ASTRONOMICAL JOURNAL,2018,155(2).
APA	Yu, Po-Chieh.,Yu, Chang-Hsien.,Lee, Chien-De.,Lin, Chien-Cheng.,Hsia, Chih-Hao.,...&Kulkarni, Shrinivas R..(2018).Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates.ASTRONOMICAL JOURNAL,155(2).
MLA	Yu, Po-Chieh,et al."Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates".ASTRONOMICAL JOURNAL 155.2(2018).