The Evolved Stars of the Globular Cluster M 55

Details The Evolved Stars of the Globular Cluster M 55 The Evolved Stars of the Globular Cluster M 55

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2610v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #26.10; Bulletin of the American Astronomical Society, V

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We have compiled literature data for the AGB, HB, and upper RGB stars in the globular cluster M 55 (NGC 6809) covering from the core out to more than 7.5 arcmin. We also examined the number ratios of stars in different evolutionary phases. While other population ratios appear to have values consistent with predictions from synthetic HB models, the R2 = NAGB/NHB ratio is about 3σ away from the expected value. M 55 has an HB morphology similar to that of M 5, a cluster that also exhibits a high R2 value. We discuss the meaning of this discrepancy and its relation to HB and AGB lifetimes.

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