Browsing by Author "Contreras, R."
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- ItemDiscovery of More Than 200 RR Lyrae Variables in M62: An Oosterhoff I Globular Cluster With a Predominantly Blue Horizontal Branch(2005) Contreras, R.; Catelan, Márcio
- ItemKinetic and theoretical study on nucleofugality in the phenolysis of 3-nitrophenyl and 4-nitrophenyl 4-cyanophenyl thionocarbonates(2013) Castro R., Enrique; Cañete Molina, Álvaro; Campodónico Galdames, Paola Rossana; Cepeda, M.; Pavez Guerrero, Paulina Isabel; Contreras, R.; Santos, José G.
- ItemRR Lyrae stars in M31 globular clusters: B514(2008) Contreras, R.; Federici, L.; Clementini, G.; Cacciari, C.; Merighi, R.; Kinemuchi, K.; Catelan , Marcio; Fusi Pecci, F.; Marconi, M.; Pritzl, B.; Smith, H.We present preliminary results of a variable star search in the metal-poor globular cluster B514 of the Andromeda galaxy (M31), based on Hubble Space Telescope Wide Field Planetary Camera 2 and Advanced Camera for Surveys observations. A large number of RR Lyrae stars have been identified for the first time in a globular cluster of M31. The average period of the RR Lyrae variables (< Pab > = 0.58 days and < Pc > = 0.35 days, for fundamental-mode and first-overtone pulsators, respectively) and the position in the period-amplitude diagram both suggest that B514 is likely an Oosterhoff I cluster, contrary to the general behaviour of the metal-poor globular clusters in the Milky Way, which show instead Oosterhoff type II pulsation properties....