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

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

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.169...41p&link_type=abstract

(IAU, European Regional Astronomy Meeting on New Windows to the Universe, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics a

Astronomy and Astrophysics

Astrophysics

3

Charge Coupled Devices, Color-Magnitude Diagram, Open Clusters, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Evolution

Scientific paper

The paper presents 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, and MS stars have been detected, extending the observed lower MS down to about V = 20 mag.

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