RR Lyrae stars in M31 Globular Clusters: How did the M31 Spiral Galaxy Form?

Details RR Lyrae stars in M31 Globular Clusters: How did the M31 Spiral Galaxy Form? RR Lyrae stars in M31 Globular Clusters: How did the M31 Spiral Galaxy Form?

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11081c&link_type=abstract

HST Proposal ID #11081. Cycle 15

Physics

Scientific paper

The pulsation properties of the RR Lyrae stars in the globular clusters of the Andromeda galaxy M31 have the potential to provide essential insight on the first epoch of the galaxy formation and to trace the merging episodes that led to the assembly of M31. Their mean periods along with the cluster metallicities can provide an independent estimate of the M31 cluster ages and, in turn, of the time scale of the M31 halo formation, by comparison with their Milky Way counterparts. We will observe RR Lyrae stars in 6 appropriately selected globular clusters of M31 using WFPC2 to derive periods, light curves, and physical parameters of these eyewitnesses of the first epochs of the M31 formation.

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