CCD photometry of galactic open clusters. I - NGC 7790

Details CCD photometry of galactic open clusters. I - NGC 7790 CCD photometry of galactic open clusters. I - NGC 7790

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..459r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 459-485. Research supported by

Astronomy and Astrophysics

Astronomy

27

Astronomical Photometry, Cepheid Variables, Color-Magnitude Diagram, Open Clusters, Interstellar Extinction, Main Sequence Stars, Stellar Composition, Stellar Evolution

Scientific paper

An analysis of BVRI CCD photometry of NGC 7790 has led to the identification of 153 stars as cluster members. Color-magnitude diagrams are used to provide a reddening estimate of E(B-V) = 0.54 + or - 0.04 and a distance modulus estimate of (m - M)0 = 12.65 + or - 0.15 for the cluster. Standard models yield an age for NGC 7790 of (5.0 + or - 1.5) x 10 to the 7th yr, while models with overshooting yield an age of (1.0 + or - 0.2) x 10 to the 8th yr. Zero points of the period-luminosity and period-luminosity-color relations are obtained using the three Cepheids that are commonly assumed to be cluster members.

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