Searching for Be Stars in the Open Cluster NGC 663
Abstract
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.
Additional Information
© 2015 American Astronomical Society. Received 2014 August 8; accepted 2014 October 14; published 2015 January 7. We thank the referee for constructive comments. We also thank C. K. Chang, M. Kasiliwal, and H. C. Chen for useful discussions and information. This work is supported in part by the National Science Council of Taiwan under grants NSC 101-2119-M-008-007-MY3 (W.-H.I.), NSC 102-2119-M-008-001 (W.-P.C.), and NSC101-2112-M-008-017-MY3 (C.-C.N.). This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.Attached Files
Published - 1538-3881_149_2_43.pdf
Submitted - 1411.5496v1.pdf
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Additional details
- Eprint ID
- 55627
- Resolver ID
- CaltechAUTHORS:20150309-092112610
- National Science Council (Taipei)
- NSC 101-2119-M-008-007-MY3
- National Science Council (Taipei)
- NSC 102-2119-M-008-001
- National Science Council (Taipei)
- NSC 101-2112-M-008-017-MY3
- NASA/JPL/Caltech
- NSF
- Created
-
2015-03-09Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC), Palomar Transient Factory, Division of Geological and Planetary Sciences (GPS)