Searching for be stars in the open cluster NGC 663

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题名:	Searching for be stars in the open cluster NGC 663
作者:	葉永烜;Yu (俞伯傑), P. C.;Lin (林建爭), C. C.;Chen (陳文屏), W. P.;Lee (李建德), C. D.;Ip (葉永烜), W. H.;Ngeow (饒兆聰), C. C.;Laher (良主嶺亜), Russ;Surace, Jason;Kulkarni, Shrinivas R.
贡献者:	理學院天文研究所
关键词:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;COLOR;DWARF STARS;EMISSION;EMISSION SPECTRA;GALAXIES;galaxies: star clusters: individual (NGC 663);GIANT STARS;Industrial plants;Open clusters;PHOTOMETRY;Pilots;PROPER MOTION;ROTATION;Spectra;STAR CLUSTERS;STAR EVOLUTION;STARS;stars: emission-line, Be;STATISTICS;TRANSIENTS
日期:	2015-02-01
上传时间:	2026-04-21 14:32:59 (UTC+8)
出版者:	IOP Publishing Ltd.;United States: The American Astronomical Society
摘要:	摘要： ABSTRACT We present Be star candidates in the open cluster NGC 663, identified by H 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. 其他題名： AJ 其他題名： Astron. J 出版者： United States: The American Astronomical Society 出版日期： 2015-02-01 出處： The Astronomical journal, 2015-02, Vol.149 (2), p.43-7 資源來源： Institute of Physics Journals 版權： 2015. The American Astronomical Society. All rights reserved. 識別號： ISSN: 0004-6256 識別號： ISSN: 1538-3881 識別號： EISSN: 1538-3881 識別號： DOI: 10.1088/0004-6256/149/2/43
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