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Monitoring survey of pulsating giant stars in the Local Group galaxies: Survey description, science goals, target selection
, Article International Conference Frontiers in Theoretical and Applied Physics, FTAPS 2017, 22 February 2017 through 25 February 2017 ; Volume 869, Issue 1 , 2017 ; 17426588 (ISSN) ; Javadi, A ; Van Loon, J. T ; Khosroshahi, H ; Abedi, A ; Bamber, J ; Hashemi, S. A ; Nikzat, F ; Molaei Nezhad, A ; APS Physics; et al.; IAU-OAD; McGraw-Hill Education; MRS; Physica Scripta ; Sharif University of Technology
Institute of Physics Publishing
2017
Abstract
The population of nearby dwarf galaxies in the Local Group constitutes a complete galactic environment, perfect suited for studying the connection between stellar populations and galaxy evolution. In this study, we are conducting an optical monitoring survey of the majority of dwarf galaxies in the Local Group, with the Isaac Newton Telescope (INT), to identify long period variable stars (LPVs). These stars are at the end points of their evolution and therefore their luminosity can be directly translated into their birth masses; this enables us to reconstruct the star formation history. By the end of the monitoring survey, we will have performed observations over ten epochs, spaced...
Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations
, Article Astronomy and Astrophysics ; Volume 573 , January , 2015 ; 00046361 (ISSN) ; Bramich, D. M ; Figuera Jaimes, R ; Jørgensen, U. G ; Kains, N ; Arellano Ferro, A ; Alsubai, K. A ; Bozza, V ; Calchi Novati, S ; Ciceri, S ; D'Ago, G ; Dominik, M ; Galianni, P ; Gu, S. H ; Harpsøe, K. B. W ; Haugbølle, T ; Hinse, T. C ; Hundertmark, M ; Juncher, D ; Korhonen, H ; Liebig, C ; Mancini, L ; Popovas, A ; Rabus, M ; Rahvar, S ; Scarpetta, G ; Schmidt, R. W ; Snodgrass, C ; Southworth, J ; Starkey, D ; Street, R. A ; Surdej, J ; Wang, X. B ; Wertz, O ; Sharif University of Technology
EDP Sciences
2015
Abstract
Aims. In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal-rich ([Fe/H] > -1) globular clusters: NGC 6388, NGC 6441, NGC 6528, NGC 6638, and NGC 6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. Methods. The observations were made with the electron-multiplying charge-couple device (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using difference image analysis to obtain high-precision light curves of the variable stars. Results. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions...