Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813304a&link_type=abstract
American Astronomical Society, AAS Meeting #218, #133.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Anthony-Twarog Barbara J.
Carraro Giovanni
Costa Edgar
Jones Barbara
Twarog Bruce
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