Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...361..929m&link_type=abstract
Astronomy and Astrophysics, v.361, p.929-936 (2000)
Astronomy and Astrophysics
Astrophysics
18
Galaxy: Open Clusters And Associations: Individual: Ic 4651, Stars: Hertzsprung-Russel (Hr) And C-M Diagrams
Scientific paper
New accurate CCD photometry in the u, v, b and y bands of the Strömgren system filters has been obtained for 17640 stars to V ~ 20m in a ~ 21 ' x 21' field centered on the intermediate-age open cluster IC 4651. The resulting color-magnitude diagram (CMD) is substantially improved in completeness and accuracy compared to previous studies of IC 4651. Specifically, this study has: 1) more than doubled the known size of the cluster area on the sky, 2) more than doubled the number of stars brighter than V ~ 14m, 3) added 160 ``new" candidate member stars to the turn-off region of the CMD, 4) identified ~ 600 fainter stars that trace a previously undetected and well-defined main-sequence down to V ~ 18m, and 5) enabled a very accurate determination of true distance modulus ((m-M)0 = 10.03 +/- 0.1) by fitting the Hyades main-sequence over the long stretch of the cluster main-sequence. The (v-y) - V CMD defines the main-sequence significantly better than the traditional (b-y) or (B-V) CMDs. These findings make IC 4651 a perfect target for testing stellar evolution models. A correlation is found between the CMD and the radial distance of the stars to the cluster center. The fainter main-sequence stars are less centrally concentrated, as predicted by theory. Overall, IC 4651 appears to be a moderately dynamically evolved cluster ideally suited for testing of dynamical models. Based on observations obtained with the Danish 1.5-m telescope at the European Southern Observatory, La Silla, Chile. Tables 1, 2 and 3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
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