C. O. Heinke et al. :: We have identified a new transient luminous low-mass X-ray binary, NGC 6440 X-2, with Chandra/ACIS, RXTE/PCA, and Swift/XRT observations of the globular cluster NGC 6440….
Y. Schuberth, T. Richtler, M. Hilker, B. Dirsch, L. P. Bassino, A. J. Romanowsky, L. Infante :: We use the largest set of globular cluster velocities obtained so far of any elliptical galaxy to revise and extend the previous investigations of the dynamics of NGC 1399, the central dominant galaxy of the nearby Fornax cluster of galaxies…
J. Kaluzny, M. Rozyczka, I.B. Thompson, K. Zloczewski ..We report the analysis of a binary blue straggler in NGC 6752 with a short orbital period of 0.315 d and a W UMA-type light curve…
J. I. Gonzalez Hernandez, P. Bonifacio, E. Caffau, M. Steffen, H.-G. Ludwig, N. T. Behara, L. Sbordone, R. Cayrel, S. Zaggia :: Most Globular Clusters are believed to host a single stellar populations. They can thus be considered a good place to study the Spite plateau and probe for possible evolutionary modifications of the Li content. We want to determine the Li content of subgiant (SG) and Main Sequence (MS) stars of the old, metal-poor globular cluster NGC 6397.
S.E. de Mink, O.R. Pols, N. Langer, R.G. Izzard :: Abundance anomalies observed in globular cluster stars indicate pollution with material processed by hydrogen burning. Two main sources have been suggested: asymptotic giant branch (AGB) stars and massive stars rotating near the break-up limit (spin stars). We propose massive binaries as an alternative source.
A. Arellano Ferro, Sunetra Giridhar, D.M. Bramich :: We report the results of CCD V, r and I time-series photometry of the globular cluster NGC 5053. New times of maximum light are given for the eight known RR Lyrae stars in the field of our images and their periods are revised…
H. H. Huang, W. Becker :: The millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397 shows radio eclipses over ~40% of its binary orbit. A first Chandra observation revealed indications for the X-ray flux being orbit dependent as well. In this work we analysed five data sets of archival Chandra data taken between 2000 and 2007 in order to investigate the emission across the pulsar’s binary orbit….
Eugenio Carretta, Angela Bragaglia, Raffaele Gratton, Valentina D’Orazi, Sara Lucatello :: We have collected spectra of about 2000 red giant branch (RGB) stars in 19 Galactic globular clusters (GC) using FLAMES@VLT (about 100 star with GIRAFFE and about 10 with UVES, respectively, in each GC). These observations provide an unprecedented, precise, and homogeneous data-set of Fe abundances in GCs….
