A photometric analysis of the intermediate-age open cluster NGC 5822

Details A photometric analysis of the intermediate-age open cluster NGC 5822 A photometric analysis of the intermediate-age open cluster NGC 5822

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105...78t&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 683, p. 78-97.

Astronomy and Astrophysics

Astronomy

31

Open Clusters, Red Giant Stars, Stellar Spectrophotometry, Astronomical Photography, Color-Magnitude Diagram, Interstellar Extinction, Metallicity, Stellar Convection, Stellar Models, Ubv Spectra

Scientific paper

The study presents photoelectric photometry of stars in NGC 5822 on the UBVR and DDO systems. The BV data are employed to calibrate a photographic survey of the cluster, while UBV and DDO data are used to constrain the cluster reddening and metallicity. Taken in conjunction with previous photometric analysis, it is found that the cluster has a reddening of 0.15 +/- 0.015 (pe) as defined for the stars at the turnoff, and a metallicity relative to the sun of -0.15 +/- 0.05 (pe). Comparisons to isochrones without convective overshoot indicate an age of 1.25 x 10 exp 9 yr and are generally in agreement with observation if the scatter near the turnoff results from a combination of a modest hydrogen-exhaustion hook, binaries, and field-star contamination. It is shown that when isochrones of the appropriate metallicity are consistently normalized, the nonovershoot models do not adequately match the observations of intermediate-age clusters in that they cannot reproduce the shape of the CMD or the distribution of stars near the turnoff, nor do they predict the apparent trend of luminosity with age found for the red giant clump.

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