SEARCHING FOR Be STARS IN THE OPEN CLUSTER NGC 663

被引：8

作者：

Yu, P. C. ^{[1
]}

Lin, C. C. ^{[1
]}

Chen, W. P. ^{[1
,2
]}

Lee, C. D. ^{[1
]}

Ip, W. H. ^{[1
,3
]}

Ngeow, C. C. ^{[1
]}

Laher, Russ ^{[4
]}

Surace, Jason ^{[4
]}

Kulkarni, Shrinivas R. ^{[5
]}

机构：

[1] Natl Cent Univ, Grad Inst Astron, Jhongli 32001, Taiwan

[2] Natl Cent Univ, Dept Phys, Jhongli 32001, Taiwan

[3] Natl Cent Univ, Inst Space Sci, Jhongli 32001, Taiwan

[4] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[5] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

来源：

ASTRONOMICAL JOURNAL | 2015年 / 149卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

galaxies: star clusters: individual (NGC 663); stars:; emission-line; Be; EMISSION-LINE STARS; YOUNG OPEN CLUSTERS; EVOLUTIONARY STATUS; PHOTOMETRY; NGC-663; SYSTEMS;

D O I：

10.1088/0004-6256/149/2/43

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Be star candidates in the open cluster NGC 663, identified by H alpha 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.

引用

页数：7

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