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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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