New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region

Details New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region New Photometric Data of Old Open Clusters in the Anti-Galactic Center Region

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..295h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.2, pp. 295-311

Astronomy and Astrophysics

Astronomy

20

Galaxy: Evolution, Galaxy: Open Clusters And Associations: General, Galaxy: Structure, Ism: Extinction

Scientific paper

We present new photometric data for 14 galactic open clusters taken by the 65cm telescope at Gunma Astronomical Observatory. They were in the anti-galactic center region selected from the Catalog of Open Cluster Data (Lyngå 1987). We estimated the parameters of the clusters, i.e., age, metallicity, distance, and reddening, by fitting Padova isochrones to the color-magnitude diagram. While no clusters were dated to be as old as young globular clusters, 13 clusters out of 14 are older than 1Gyr, ranging up to ˜ 3.6 Gyr. Bearing in mind that out of approximately 500 clusters dated so far, only 40 clusters are older than 1Gyr, our sample is exclusively dominated by old clusters. Four clusters were found away from the metallicity gradient curve and age-metallicity relation so far delineated. Especially, 3 metal-rich clusters in the outer disk (Berkeley 36, Biurakan 11, and Biurakan 13) provide evidence against the picture advocated by Twarog etal. (1997, AJ, 114, 2556) that there is a break in the metallicity distribution at rGC = 10 kpc and that the outer disk is chemically less evolved than in the inner disk.

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