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Paper: Is There an AGB Star in NGC 6791?
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 451
Authors: Hartig, E.; Lebzelter, T.; Hinkle, K. H.
Abstract: Unique in many ways, NGC 6791 is one of the richest and most populous open clusters in our Galaxy, and with an age of 8 – 10 Gyr it is quite possibly the oldest. One of the mysteries of the cluster is the low brightness of its RGB-tip which in combination with other features of the CMD fuels speculation on an enhanced mass loss on the RGB and an evolution avoiding a core-helium flash. We re-investigated the variable star population of the cluster's giant branch to look for AGB star candidates. Time-series images of the cluster were used to identify long-period variable stars. Reanalysis of existing photometric, spectroscopic and proper-motion data was employed to separate cluster and field stars and to characterize the cluster variables.
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