CCD photometry on the UBVI system has been obtained and analyzed for an area 40’ x 40' centered on the open cluster NGC 5822. CCD photometry on the uvbyCaHβɛκα system has also been obtained and analyzed for the core region of the cluster. The intermediate-band data for 110 probable single-star A and F cluster members show that the cluster is only mildly reddened, with E(B-V) = 0.104, but is superposed on a field where the typical background star has E(B-V) > 0.4, making separation of the cluster from the field using intermediate-band data a straightforward process down V = 17. From 61 F dwarfs, the metallicity from m1 and hk is [Fe/H] = -0.02. Combining the reddening and metallicity with appropriate isochrones produces an age estimate of 0.95 Gyr, with an uncertainty below 0.1 Gyr.
A Broad-band And Intermediate-band Photometric Study Of The Intermediate-age Open Cluster, Ngc 5822
CARRARO, GIOVANNI;
2011
Abstract
CCD photometry on the UBVI system has been obtained and analyzed for an area 40’ x 40' centered on the open cluster NGC 5822. CCD photometry on the uvbyCaHβɛκα system has also been obtained and analyzed for the core region of the cluster. The intermediate-band data for 110 probable single-star A and F cluster members show that the cluster is only mildly reddened, with E(B-V) = 0.104, but is superposed on a field where the typical background star has E(B-V) > 0.4, making separation of the cluster from the field using intermediate-band data a straightforward process down V = 17. From 61 F dwarfs, the metallicity from m1 and hk is [Fe/H] = -0.02. Combining the reddening and metallicity with appropriate isochrones produces an age estimate of 0.95 Gyr, with an uncertainty below 0.1 Gyr.Pubblicazioni consigliate
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