WIYN Open Cluster Study. II. UBVRI CCD Photometry of the Open Cluster NGC 188

Details WIYN Open Cluster Study. II. UBVRI CCD Photometry of the Open Cluster NGC 188 WIYN Open Cluster Study. II. UBVRI CCD Photometry of the Open Cluster NGC 188

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.2894s&link_type=abstract

The Astronomical Journal, Volume 118, Issue 6, pp. 2894-2907.

Astronomy and Astrophysics

Astronomy

70

Galaxies: Formation, Galaxies: Star Clusters

Scientific paper

We present high-precision UBVRI CCD photometry of the old open cluster NGC 188. Our color-magnitude diagram extends from near the red giant branch tip to as faint as ~5 mag below the main-sequence turnoff. From an analysis of these data along with published photometry for M67, we draw the following conclusions: (1) From the UBV two-color diagram, we find a reddening of E(B-V)=0.04+/-0.02 for M67 and E(B-V)=0.09+/-0.02 for NGC 188. (2) Based on main-sequence fitting to solar abundance isochrones, the distance moduli turn out to be (m-M)v=9.69+/-0.11 for M67 and (m-M)v=11.44+/-0.08 for NGC 188. (3) The comparison of the CMDs to theoretical isochrones indicates that an amount of core convective overshoot equivalent to 0.10 of a pressure scale height is appropriate for M67, while no overshoot is required to fit the CMD of NGC 188. These isochrones suggest that NGC 188 is 3.0+/-0.7 Gyr older than M67. (4) There is a clear indication of mass segregation in both M67 and NGC 188, with the most massive stars (M/Msolar>1.1) being more centrally concentrated than those that are the least massive (0.8>=M/Msolar>0.65).

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