In this first paper, we measured the strength of the CN and CH band indices, which correlate with the N and C abundances, and we investigated the anti-correlation and bimodality of these indices. We compared rCN, the ratio of stars belonging to the CN-strong and weak groups, with 15 different cluster parameters. (1 data file).

Following the refined position of the faint X-ray transient XTE J1728-295 (ATel #2824) also named IGR J17285-2922 and currently in outburst (ATel #2823, #2825), we report a search for the optical counterpart using the Faulkes Telescope South (located at Siding Spring, Australia). We performed imaging of the field centred on the Swift XRT position

Two of us (M.M. and J.A.L.A.) imaged five galaxy clusters with the 2.5m Nordic Optical Telescope (NOT) located at the Roque de Los Muchachos Observatory (La Palma). The observations were taken with the Stand Camera, with a field of view of 3'x3', a plate scale of 0.176"/pix, a gain of 1.69e-/ADU and a readout noise of 6.36e-. All images were taken

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The Observatorio del Roque de los Muchachos (ORM), in the Canary Islands (Spain), was one of the candidates to host the future European Extremely Large Telescope (E-ELT) and is the site of the Gran Telescopio Canarias (GTC), the largest optical infrared facility to date. Sky transparency is a key parameter as it defines the quality of the

In July, the transient neutron star low-mass X-ray binary Aql X-1 was detected in outburst at X-ray, UV, optical and near-infrared wavelengths (ATel #2742, #2744, #2748). On 1st September the X-rays re-brightened (ATel #2850). Here we report on our ongoing optical monitoring campaign (ATel #1218, #1970, #2288) with the Faulkes Telescopes North and