We present CCD photometry for stars in three fields centered on the old open cluster NGC 188 and in four fields on the intermediate-age cluster NGC 7789, which has been performed with the aim of investigating the HR diagram distribution of the cluster's Main-Sequence (MS) stars. A sufficiently well-defined sequence of subgiant, turn-off (TO), and MS stars have been detected, extending the observed lower MS down to aboutV=20 mag.
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Paez, E., Roger, C.M., Arribas, S. et al. The oldest galactic open clusters: New CCD photometry and colour-magnitude diagrams. Astrophys Space Sci 169, 41–44 (1990). https://doi.org/10.1007/BF00640683
- Open Cluster
- Diagram Distribution
- Galactic Open Cluster