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• W3104101308 abstract "<i>Aims. <i/>With the aim of increasing the sample of M 31 clusters for which a colour–magnitude diagram is available, we searched the HST archive for ACS images containing objects included in the Revised Bologna Catalogue of M 31 globular clusters (RBC Version 3.5 available at: http://www.bo.astro.it/M31).<i>Methods. <i/>Sixty-three such objects were found. We used the ACS images to confirm or revise their classification and were able to obtain useful CMDs for 11 old globular clusters and 6 luminous young clusters. We obtained simultaneous estimates of the distance, reddening, and metallicity of old clusters by comparing their observed field-decontaminated CMDs with a grid of template clusters of the Milky Way. We estimated the age of the young clusters by fitting with theoretical isochrones.<i>Results. <i/>For the old clusters, we found metallicities in the range -0.4 <i>≤<i/> [Fe/H] <i>≤<i/> -1.9. The individual estimates generally agree with existing spectroscopic estimates. At least four of them display a clear blue horizontal branch, indicating ages 10 Gyr. All six candidate young clusters are found to have ages <1 Gyr. The photometry of the clusters is made publicly available through a dedicated web page.<i>Conclusions. <i/>With the present work the total number of M 31 GCs with reliable optical CMD increases from 35 to 44 for the old clusters, and from 7 to 11 for the young ones. The old clusters show similar characteristics to those of the MW. We discuss the case of the cluster B407, with a metallicity [Fe/H] -0.6 and located at a large projected distance from the centre of M 31 = 19.8 kpc) and from the major axis of the galaxy (<i>Y<i/> = 11.3 kpc). Metal-rich globulars at large galactocentric distances are rare both in M 31 and in the Milky Way. B407, in addition, has a velocity in stark contrast with the rotation pattern shared by the bulk of M 31 clusters of similar metallicity. This, along with other empirical evidence, supports the hypothesis that the cluster (together with B403) is physically associated with a substructure in the halo of M 31 that has been interpreted as the relic of a merging event." @default.
• W3104101308 created "2020-11-23" @default.
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• W3104101308 date "2009-10-08" @default.
• W3104101308 modified "2023-09-24" @default.
• W3104101308 title "HST/ACS colour–magnitude diagrams of M 31 globular clusters" @default.
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• W3104101308 doi "https://doi.org/10.1051/0004-6361/200912587" @default.
• W3104101308 hasPublicationYear "2009" @default.
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