Articulo
Pulsating stars in omega Centauri Near-IR properties and period-luminosity relations
WIDE-FIELD VARIABILITY SURVEYS: A 21ST CENTURY PERSPECTIVE
Registro en:
1150345
1150345
Autor
Navarrete, Camila
Catelan, Marcio
Contreras-Ramos, Rodrigo
Alonso-Garcia, Javier
Gran, Felipe
Dekany, Istvan
Minniti, Dante
Institución
Resumen
omega Centauri (NGC 5139) contains many variable stars of different types, including the pulsating type II Cepheids, RR Lyrae and SX Phoenicis stars. We carried out a deep, wide-field, near-infrared (IR) variability survey of omega Cen, using the VISTA telescope. We assembled an unprecedented homogeneous and complete J and K-S near-IR catalog of variable stars in the field of omega Cen. In this paper we compare optical and near-IR light curves of RR Lyrae stars, emphasizing the main differences. Moreover, we discuss the ability of near-IR observations to detect SX Phoenicis stars given the fact that the amplitudes are much smaller in these bands compared to the optical. Finally, we consider the case in which all the pulsating stars in the three different variability types follow a single period-luminosity relation in the near-IR bands. Regular 2015 FONDECYT FONDECYT