WOCS Variability Study: NGC 188 revised

Details WOCS Variability Study: NGC 188 revised WOCS Variability Study: NGC 188 revised

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.1405c&link_type=abstract

American Astronomical Society Meeting 205, #14.05; Bulletin of the American Astronomical Society, Vol. 36, p.1361

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a variability study of the old (7.0+/-0.5Gy) open cluster NGC 188 as a part of the WIYN Open Cluster Study (WOCS). Data were acquired with the KPNO 4-m telescope/T2KB CCD during 4 dark photometric nights in November of 1996. Two filters (V & I) were used covering the 20'x20' central region of the cluster. We discuss our data reduction techniques, including use of AstroVar, a custom interactive program based on the method of incomplete ensemble photometry. As a result of our search, a number of variable stars were recovered. Among them, we exhibit the W UMa systems of the cluster, a couple of which appear to display unequal maxima in their light curves (likely due to the presence of star spots) plus a new eclipsing system.

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