BV Photometry for the ~2.5 Gyr Open Cluster NGC 6819: More Evidence for Convective Core Overshooting on the Main Sequence

Details BV Photometry for the ~2.5 Gyr Open Cluster NGC 6819: More Evidence for Convective Core Overshooting on the Main Sequence BV Photometry for the ~2.5 Gyr Open Cluster NGC 6819: More Evidence for Convective Core Overshooting on the Main Sequence

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.1516r&link_type=abstract

The Astronomical Journal, Volume 115, Issue 4, pp. 1516-1523.

Astronomy and Astrophysics

Astronomy

54

Open Clusters And Associations: Individual: Ngc 6819, Stars: Evolution

Scientific paper

New BV photometry is presented for the populous, intermediate-age open cluster NGC 6819. From ~4 mag below the turnoff to ~2 mag above the red giant clump, the cluster's color-magnitude diagram is well defined. Of particular note is the fact that the bright end of the main-sequence distribution exhibits a pronounced curvature to the red. This morphology can be matched by theoretical stellar models only if a significant amount of convective core overshooting is assumed. Indeed, canonical, nonovershooting calculations fail by a wide margin to explain the observations. Comparisons with up-to-date evolutionary tracks, isochrones, and zero-age horizontal-branch loci for [Fe/H] = 0.0 and -0.10 indicate that the [Fe/H] ~ -0.05 cluster has (m - M)_V = 12.35, E(B - V) = 0.16, and an age near 2.4 Gyr. The existence of several clump stars that appear to be appreciably more massive than the turnoff stars is noted: we suggest that they are the descendants of blue stragglers, given that NGC 6819 has a confirmed blue straggler population.

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