Browsing by Author "Dékány, I."

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    Establishing the galactic centre distance using VVV bulge RR lyrae variables
    (2018) Majaess, D.; Dékány, I.; Hajdu, Gergely; Minniti, D.; Turner, D.; Gieren Waiblinger, Wolfgang Paul
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    The VVV Templates Project
    (2014) Contreras Ramos, R.; Catelan, Marcio; Gran, F.; Navarrete, C.; Angeloni, R.; Alonso-García, J.; Dékány, I.; Hajdu, G.; Hempel, M.; Jordán, A.; Townsend, B.; Borissova, J.; Navarro, C.; Pichara, K.; Eyheramendy, S.
    Until now, stellar variability in the near-IR has been a relatively ill-explored research field. In particular, the number of high-quality light curves is very limited and, even worse, many variability classes have not yet been observed in a sufficiently extensive way in the near-IR, so that good light curves are entirely lacking for some such classes. Since VVV is the first ever large survey dedicated to stellar variability in the near-infrared, the first problem we had to face has thus been the construction of a proper statistically significant database of high-quality (i.e., template) near-IR light curves for a significant sample of stars taken to be representative of the different variability classes under study. The main purpose of the VVV Templates Project is thus to build a large database of well-defined, high-quality, near-IR light curves for variable stars of different types, which will form the basis of the VVV automated classification algorithms...
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    The VVV Templates Project Towards Automated Classification of VVV Light Curves
    (2011) Catelan, Marcio; Angeloni, R.; Dékány, I.; Pichara, K.; Eyheramendy, S.; Borissova, J.
    The main goal of the VVV Templates Project is to build a large database of well-defined, high-quality near-IR light curves for variable stars of different types, which will form the basis of the VVV automated classification algorithms.
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    Variability Survey of ω Centauri in the Near-IR: Period-Luminosity Relations
    (2017) Navarrete, C.; Catelan, Marcio; Contreras Ramos, R.; Gran, F.; Alonso-García, J.; Dékány, I.
    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 K S 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.