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2 results

  • Variability Survey of ω Centauri in the Near-IR: Period-Luminosity Relations

  • C. Navarrete, M. Catelan, R. Contreras Ramos, F. Gran, J. Alonso-García, I. Dékány
  • Journal:
    Proceedings of the International Astronomical Union / Volume 12 / Issue S316 / August 2015
    Published online by Cambridge University Press:
    31 March 2017, pp. 351-352
    Print publication:
    August 2015
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  • ω Centauri is by far the most massive globular star cluster in the Milky Way, and possibly the remnant of a dwarf galaxy. As such, it contains a large number of variable stars of different classes. Here we report on an extensive, wide-field time-series study of ω Cen in the J and KS bands, which has allowed us to study the near-IR period-luminosity relations for different variability classes, including the first such relations for the SX Phoenicis stars.

  • Wide-field variability survey of the globular cluster NGC 4833

  • Grzegorz Kopacki
  • Journal:
    Proceedings of the International Astronomical Union / Volume 9 / Issue S301 / August 2013
    Published online by Cambridge University Press:
    18 February 2014, pp. 441-442
    Print publication:
    August 2013
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  • We present preliminary results of the variability survey in the field of the globular cluster NGC 4833. We observed all 34 variable stars known in the cluster. In addition, we have found two new SX Phoenicis stars, one new RR Lyrae star, twelve new eclipsing systems mostly of the W Ursae Majoris type, nine new variable red giants, and ten new field-stars showing irregular variations. Properties of RR Lyrae stars indicate that NGC 4833 is an Oosterhoff's type II globular cluster.