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Abstract: We observed two fields near M32 with the ACS-HRC on board the Hubble SpaceTelescope, located at distances of about 1.8- and 5.4- hereafter F1 and F2,respectively from the center of M32. To obtain a very detailed and deepcolor-magnitude diagram CMD and to look for short period variability, weobtained time-series imaging of each field in 32-orbit-long exposures using theF435W B and F555W V filters, spanning a temporal range of 2 days perfilter. We focus on our detection of variability on RR Lyrae variable stars,which represents the only way to obtain information about the presence of avery old population larger than 10 Gyr in M32 from optical data. Here wepresent results obtained from the detection of 31 RR Lyrae in these fields: 17in F1 and 14 in F2.



Autor: G. Fiorentino, A. Monachesi, S. Trager, T. Lauer, A. Saha, K. Mighell, W. L. Freedman, A. Dressler, C. J. Grillmair, E. Tolstoy

Fuente: https://arxiv.org/



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