Fundamental parameters and new variables of the galactic open cluster NGC 7128

Z. Balog, A. J. Delgado, A. Moitinho, G. Furész, G. Kaszás, J. Vinkó, E. J. Alfaro

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

CCD photometry in Johnson UBV and Strömgren uvby systems and medium-resolution spectroscopy of the galactic open cluster NGC 7128 are presented. Spectral types of the brightest 12 stars in the cluster field were determined based on equivalent widths of the Hα and the He I 6678-Å line. The spectroscopic observations also revealed two obvious and one probable Be-type stars showing Hα emission. The analysis of the photometric diagrams gave a colour excess of E(B - V) = 1.03 ± 0.06 mag, a distance modulus DM = 13.0 ± 0.2 mag and an age above 10 Myr. Time-resolved photometric observations obtained on one night resulted in the detection of short time-scale light variations of seven new and three already known variable stars in the cluster field.

Original languageEnglish
Pages (from-to)872-886
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume323
Issue number4
DOIs
Publication statusPublished - Jun 1 2001

Keywords

  • Open clusters and associations: individual: NGC 7128
  • Stars: variables: Other
  • Techniques: photometric
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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