Discovery of Variable Stars in the Field of the Galactic Open Cluster NGC 7039

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题名:	Discovery of Variable Stars in the Field of the Galactic Open Cluster NGC 7039
作者:	Hu,JH;Chen,HC;Chen,YT;Chang,DC;Lin,HW;Ngeow,CC;Chen,WP;Ip,WH
贡献者:	天文研究所
关键词:	CATALOG;PARAMETERS;PHOTOMETRY
日期:	2011
上传时间:	2012-03-27 18:11:35 (UTC+8)
出版者:	國立中央大學
摘要:	We report variable stars identified in the field of the Galactic open cluster, NGC 7039. In the fall/winter of 2009, imaging photometry has been acquired, mainly in the R band, for eight open clusters using the 81 cm Tenagra telescope in Arizona. We present the results for our first target, NGC 7039. We have found 42 new variable stars and six suspected variable stars. Among the variable stars, there are 14 eclipsing binaries, including one RS Callum Venaticorum-type system, one RR Lyrae, two Cepheid, one beta Cephei, three delta Scuti, eight pulsating-like stars, five variable stars with periods longer than the observation window of 41 days, and eight irregular variable stars. Two contact binary systems could be members of NGC 7039 because of their loci in the color-magnitude diagram and their distance moduli close to that of the open cluster. One of the contact binary systems shows infrared excess in the (J - H) and (H - K(s)) diagrams. It could have circumstellar dust. None of the pulsating stars belong to the open cluster.
關聯:	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
显示于类别:	[天文研究所] 期刊論文

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