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Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry
, Article Astronomy and Astrophysics ; Volume 555 , 2013 ; 00046361 (ISSN) ; Bramich, D. M ; Arellano Ferro, A ; Figuera Jaimes, R ; Jørgensen, U. G ; Giridhar, S ; Penny, M. T ; Alsubai, K. A ; Andersen, J. M ; Bozza, V ; Browne, P ; Burgdorf, M ; Calchi Novati, S ; Damerdji, Y ; Diehl, C ; Dodds, P ; Dominik, M ; Elyiv, A ; Fang, X. S ; Giannini, E ; Gu, S. H ; Hardis, S ; Harpsøe, K ; Hinse, T. C ; Hornstrup, A ; Hundertmark, M ; Jessen Hansen, J ; Juncher, D ; Kerins, E ; Kjeldsen, H ; Korhonen, H ; Liebig, C ; Lund, M. N ; Lundkvist, M ; Mancini, L ; Martin, R ; Mathiasen, M ; Rabus, M ; Rahvar, S ; Ricci, D ; Sahu, K ; Scarpetta, G ; Skottfelt, J ; Snodgrass, C ; Southworth, J ; Surdej, J ; Tregloan Reed, J ; Vilela, C ; Wertz, O ; Williams, A
2013
Abstract
Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We used our data to search for variable stars in this cluster and refine the periods of known variables; we then used our variable star light curves to derive values for the cluster's parameters. Methods. We used difference image analysis to reduce our data to obtain high-precision light curves of variable stars. We then estimated the cluster parameters by performing a Fourier decomposition of the light curves of RR Lyrae stars for which a good period estimate was possible. We also derived an estimate for the age of the cluster by fitting theoretical...