Be STARS IN THE OPEN CLUSTER NGC 6830
/ Authors
Po-Chieh Yu(俞伯傑), Chien-Cheng Lin(林建爭), Hsing-Wen Lin(林省文), Chien-De Lee(李建德), N. Konidaris, Chow-Choong Ngeow(饒兆聰), Wing-Huen Ip(葉永烜), Wen-Ping Chen(陳文屏), Hui-Chen Chen(陳慧真), M. Malkan
and 11 more authors
Chan-Kao Chang(章展誥), Russ Laher(良主嶺亞), Li-Ching Huang(黃立晴), Yu-Chi Cheng(鄭宇棋), R. Edelson, A. Ritter, R. Quimby, S. Ben-Ami, E. Ofek, J. Surace, S. Kulkarni
/ Abstract
We report the discovery of two new Be stars, and re-identify one known Be star in the open cluster NGC 6830. Eleven Hα emitters were discovered using the Hα imaging photometry of the Palomar Transient Factory Survey. Stellar membership of the candidates was verified with photometric and kinematic information using 2MASS data and proper motions. The spectroscopic confirmation was carried out by using the Shane 3 m telescope at the Lick observatory. Based on their spectral types, three Hα emitters were confirmed as Be stars with Hα equivalent widths greater than −10 Å. Two objects were also observed by the new spectrograph spectral energy distribution-machine (SED-machine) on the Palomar 60-inch Telescope. The SED-machine results show strong Hα emission lines, which are consistent with the results of the Lick observations. The high efficiency of the SED-machine can provide rapid observations for Be stars in a comprehensive survey in the future.
Journal: The Astronomical Journal