PAL 1. The Youngest Globular Cluster or the Oldest Open Cluster?

Bibcode
1997IAUJD..15E..23R
Rosenberg, A.; Piotto, G.; Saviane, I.; Aparicio, A.
Bibliographical reference

The Combination of Theory, Observations, and Simulation for the Dynamics of Stars and Star Clusters in the Galaxy, 23rd meeting of the IAU, Joint Discussion 15, 25 August 1997, Kyoto, Japan, meeting abstract.

Advertised on:
0
1997
Number of authors
4
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We present a color magnitude diagram (CMD) in the V and I bands reaching 4 magnitudes below the turn off (TO) and intermediate resolution spectra for 4 giant branch (GB) stars. The spectra allowed us to determine the cluster metallicity and radial velocity for the cluster Pal 1. The metallicity has been determined using the CaII triplet and other three clusters (M2, M15 & M71) in order to calibrate the method. Preliminary results suggest a high metallicity (similar to M71) and a radial velicity of ~ -120 Km/s. A comparison with other well-observed clusters and theoretical models suggest that Pal 1 has an age of 8 plus or minus 2 Gyrs, which would make it either the youngest globular cluster or one of the oldest open clusters of our Galaxy.
Type
Non-refereed

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