Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

The oldest galactic open clusters: New CCD photometry and colour-magnitude diagrams

  • 36 Accesses

  • 2 Citations


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.

This is a preview of subscription content, log in to check access.


  1. Arribas, S. and Martinez Roger, C.: 1988,Astron. Astrophys. 206, 63.

  2. Buonnano, R., Buscema, G., Corsi, C. E., Iannicola, G., and Fussi-Pecci, F.: 1983,Astron. Astrophys. Suppl. Ser. 51, 83.

  3. Burbidge, E. M., and Sandage, A.: 1958,Astrophys. J. 128, 174.

  4. Claria, J. J.: 1979,Astrophys. Space Sci. 66, 201.

  5. Eggen, O. J. and Sandage, A.: 1969,Astrophys. J. 158, 669.

  6. Janes, K. A.: 1977,Astron. J. 82, 35.

  7. Straniero, O. and Chieffi, A.: 1989 (in prep.).

  8. Twarog, B. A. and Antony-Twarog, B. J.: 1989, preprint.

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

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).

Download citation


  • Open Cluster
  • Diagram Distribution
  • Galactic Open Cluster