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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...
OGLE 2008-BLG-290: An accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
, Article Astronomy and Astrophysics ; Volume 518, Issue 19 , 2010 ; 00046361 (ISSN) ; Heyrovsky, D ; Dong, S ; Gould, A ; Udalski, A ; Albrow, M. D ; Batista, V ; Beaulieu, J. P ; Bennett, D. P ; Bond, I. A ; Bramich, D. M ; Calchi Novati, S ; Cassan, A ; Coutures, C ; Dieters, S ; Dominik, M ; Dominis Prester, D ; Greenhill, J ; Horne, K ; Jørgensen, U. G ; Kozłowski, S ; Kubas, D ; Lee, C. H ; Marquette, J. B ; Mathiasen, M ; Menzies, J ; Monard, L.A.G ; Nishiyama, S ; Papadakis, I ; Street, R ; Sumi, T ; Williams, A ; Yee, J.C ; Brillant, S ; Caldwell, J.A.R ; Cole, A ; Cook, K.H ; Donatowicz, J ; Kains, N ; Kane, S.R ; Martin, R ; Pollard, K.R ; Sahu, K.C ; Tsapras, Y ; Wambsganss, J ; Depoy, D.L ; Gaudi, B.S ; Han, C ; Lee, C.-U ; Park, B.-G ; Pogge, R.W ; Kubiak, M ; Szymański, M.K ; Pietrzyński, G ; Soszyński, I ; Szewczyk, O ; Ulaczyk, K ; Wyrzykowski, L ; Abe, F ; Fukui, A ; Furusawa, K ; Gilmore, A.C ; Hearnshaw, J.B ; Itow, Y ; Kamiya, K ; Kilmartin, P.M ; Korpela, A.V ; Lin, W ; Ling, C.H ; Masuda, K ; Matsubara, Y ; Miyake, N ; Muraki, Y ; Nagaya, M ; Ohnishi, K ; Okumura, T ; Perrott, Y ; Rattenbury, N.J ; Saito, T ; Sako, T ; Sato, S ; Skuljan, L ; Sullivan, D ; Sweatman, W ; Tristram, P.J ; Yock, P.C.M ; Allan, A ; Bode, M.F ; Burgdorf, M.J ; Clay, N ; Fraser, S.N ; Hawkins, E ; Kerins, E ; Lister, T.A ; Mottram, C.J ; Saunders, E.S ; Snodgrass, C ; Steele, I.A ; Wheatley, P.J ; Anguita, T ; Bozza, V ; Harpsøe, K ; Hinse, T.C ; Hundertmark, M ; Kjærgaard, P ; Liebig, C ; Mancini, L ; Masi, G ; Rahvar, S ; Ricci, D ; Scarpetta, G ; Southworth, J ; Surdej, J ; Thöne, C.C ; Riffeser, A ; Seitz, S ; Bender, R ; Sharif University of Technology
Abstract
Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening. Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczyński point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement...