Discovery of variable stars in the field of the galactic open cluster NGC 7039

Juei Hwa Hu, Hui Chen Chen, Ying Tung Chen, Ding Cheng Chang, Hsing Wen Lin, Chow Choong Ngeow, W. P. Chen, Wing Huen Ip

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2 Scopus citations


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 Canum Venaticorum-type system, one RR Lyrae, two Cepheid, one β Cephei, three δ 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 - Ks) diagrams. It could have circumstellar dust. None of the pulsating stars belong to the open cluster.

Original languageEnglish
Pages (from-to)671-681
Number of pages11
JournalPublications of the Astronomical Society of the Pacific
Issue number904
StatePublished - Jun 2011


  • Appendix
  • Color figures
  • Extended table


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