Speaker
CHIEN-DE LEE
(National Central University-Taiwan)
Description
We conducted a search for Be stars in open clusters using Hα imaging photometry of the Palomar Transient Factory Survey, to investigate the connections between Be star phenomena and ages and environments of clusters. With carefully member identification, we discovered 96 Be star candidates in 32 clusters from 104 open clusters. These selected candidates and those known Be stars show a similar range of mid-infrared colors. The clusters with age 7.5 < log(t(yr)) 8.5 tend to have more Be star candidates; there is about a 40% occurrence rate within this age bin. More than 50% of the 32 clusters have Be fraction Be/(Be+B-type) < 10%, and the clusters with age 8.0 < log(t(yr)) 8.5 have the highest Be fraction. Regarding spatial distribution, Be stars are not centrally concentrated in the clusters and distribute uniformly.
Primary author
CHIEN-DE LEE
(National Central University-Taiwan)
Co-authors
Chang-Hsien Yu
(Graduate Institute of Astronomy, National Central University)
Chang-Kao Chang
(Graduate Institute of Astronomy, National Central University)
Chien-Cheng Lin
(Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory)
Chih-Hao Hsia
(Space Science Institute, Macau University of Science and Technology)
Chow-Choong Ngeow
(Graduate Institute of Astronomy, National Central University)
I-Chenn Chen
(Graduate Institute of Astronomy, National Central University)
Jason Surace
(Spitzer Science Center, California Institute of Technology)
Kulkarni Shrinivas R.
(Division of Physics, Mathematics and Astronomy, California Institute of Technology)
Po-Chieh Yu
(Graduate Institute of Astronomy, National Central University)
Russ Laher
(Infrared Processing and Analysis Center, California Institute of Technology)
Wen-Ping Chen
(Graduate Institute of Astronomy, National Central University)
Wing-Huen Ip
(Graduate Institute of Astronomy, National Central University)
