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

doi:10.3847/1538-3881/aaa45b

CORC > 上海天文台 > 中国科学院上海天文台

	Searching for Be Stars in the Open Clusters with PTF/iPTF. I. Cluster Sample and Be Star Candidates
	Yu,Po-Chieh 7; Yu,Chang-Hsien 7; Lee,Chien-De 7; Lin,Chien-Cheng 2,8; Hsia,Chih-Hao 3; Chang,Chang-Kao 7; Chen,I-Chenn 7; Ngeow,Chow-Choong 7; Ip,Wing-Huen 3,4,7; Chen,Wen-Ping 5,7
刊名	The Astronomical Journal
	2018-01-29
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	Abstract We conducted a search for Be star candidates in open clusters using Hα 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 ～2000 days with an amplitude of 0.2–0.3 mag, indicating a long timescale of disk evolution.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-155-2-AAA45B
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32083]
专题	中国科学院上海天文台
作者单位	1.Spitzer Science Center, California Institute of Technology, M/S 314-6, Pasadena, CA 91125, USA 2.Max Planck Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany 3.Space Science Institute, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau 4.Institute of Space Science, National Central University, No. 300, Zhongda Road, Zhongli Dist., Taoyuan City 32001, Taiwan 5.Department of Physics, National Central University, No. 300, Zhongda Road, Zhongli Dist., Taoyuan City 32001, Taiwan 6.Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA 7.Graduate Institute of Astronomy, National Central University, No. 300, Zhongda Road, Zhongli Dist., Taoyuan City 32001, Taiwan 8.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 9.Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
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]. The 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.The 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".The Astronomical Journal 155.2(2018).