TY - JOUR
T1 - Searching for be stars in the open cluster NGC 663
AU - Yu, P. C.
AU - Lin, C. C.
AU - Chen, W. P.
AU - Lee, C. D.
AU - Ip, W. H.
AU - Ngeow, C. C.
AU - Laher, Russ
AU - Surace, Jason
AU - Kulkarni, Shrinivas R.
N1 - Publisher Copyright:
© 2015. The American Astronomical Society. All rights reserved.
PY - 2015/2/1
Y1 - 2015/2/1
N2 - We present Be star candidates in the open cluster NGC 663, identified by Hα imaging photometry with the Palomar Transient Factory Survey, as a pilot program to investigate how the Be star phenomena, the emission spectra, extended circumstellar envelopes, and fast rotation, correlate with massive stellar evolution. Stellar membership of the candidates was verified by 2MASS magnitudes and colors and by proper motions (PMs). We discover four new Be stars and exclude one known Be star from being a member due to its inconsistent PMs. The fraction of Be stars to member stars [N(Be)/N(members)] in NGC 663 is 3.5%. The spectral type of the 34 Be stars in NGC 663 shows bimodal peaks at B0 -B2 and B5-B7, which is consistent with the statistics in most star clusters. Additionally, we also discover 23 emission-line stars of different types, including non-member Be stars, dwarfs, and giants.
AB - We present Be star candidates in the open cluster NGC 663, identified by Hα imaging photometry with the Palomar Transient Factory Survey, as a pilot program to investigate how the Be star phenomena, the emission spectra, extended circumstellar envelopes, and fast rotation, correlate with massive stellar evolution. Stellar membership of the candidates was verified by 2MASS magnitudes and colors and by proper motions (PMs). We discover four new Be stars and exclude one known Be star from being a member due to its inconsistent PMs. The fraction of Be stars to member stars [N(Be)/N(members)] in NGC 663 is 3.5%. The spectral type of the 34 Be stars in NGC 663 shows bimodal peaks at B0 -B2 and B5-B7, which is consistent with the statistics in most star clusters. Additionally, we also discover 23 emission-line stars of different types, including non-member Be stars, dwarfs, and giants.
KW - Galaxies: star clusters: individual (NGC 663)
KW - Stars: emission-line, Be
UR - http://www.scopus.com/inward/record.url?scp=84922475465&partnerID=8YFLogxK
U2 - 10.1088/0004-6256/149/2/43
DO - 10.1088/0004-6256/149/2/43
M3 - 期刊論文
AN - SCOPUS:84922475465
SN - 0004-6256
VL - 149
JO - Astronomical Journal
JF - Astronomical Journal
IS - 2
M1 - 43
ER -