The oldest galactic open clusters: New CCD photometry and colour-magnitude diagrams |
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| Authors: | E Paez C Martinez Roger S Arribas O Straniero F Caputo V Castellani |
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| Institution: | (1) Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain;(2) Scuola Normale Superiore, Pisa, Italy;(3) Istituto di Astrofisica Spaziale, CNR, Frascati, Italy;(4) Istituto di Astronomia, Pisa, Italy;(5) Osservatorio di Colurania, Teramo, Italy |
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| Abstract: | 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.Paper presented at the 11th European Regional Astronomical Meetings of the IAU on  New Windows to the Universe , held 3–8 July, 1989, Tenerife, Canary Islands, Spain. |
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